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Spinoza and Tuberculosis: His Disease and Devotion

[Tuberculosis can be a difficult disease to diagnosis. The following is working under the assumption that the diagnosis of “phthisis” for Spinoza’s long-running pulmonary problems is best understood as the disease tuberculosis.]

The Influence of Disease

It is interesting that of all the influential facts we seem to have about Spinoza’s life, his tuberculosis may be neglected only as much as his lens-grinding has been. Very little of how debilitating this disease can be, nor its chronic nature seems to be considered when framing a picture of Spinoza’s motivations for life decisions. At most his tuberculosis, called in biographies “phthisis” (its name derived from Greek) gives us a remote picture of a man made weak and coughing at times. Then there is the oft repeated, unsupported, yet romantically satisfying thought that he died not only of his TB, but also from inhalations of glass dust from his lens-grinding. The facts of the disease seldom seem to enter into the explanations for Spinoza’s decisions and life turns.

Spinoza’s early biographer Colerus tells us that Spinoza had been suffering from tuberculosis for more than 20 years when Spinoza died at the age of 44, in February of 1677:

Spinosa was a Man of a very weak Constitution, unhealthy and lean, and had been troubled with a Pthysick above twenty years, which oblig’d him to keep a strict course of Dyet, and to be extreamly sober in his Meat and Drink. Nevertheless, his Landlord, and the people of the House did not believe that he was so near his end, even a little while before he died, and they had not the least thought of it.

If we track backwards, this would place the first bout with tuberculosis very close to the date of his father’s death (March 28, 1654), and his taking over of the family firm (September 1654). Spinoza’s step mother, Esther, died only five months before his father did (October 14, 1653), after a year of serious illness, itself a year after Spinoza’s own sister Miriam had died. Tuberculosis is a highly contagious disease when symptomatic, (if living 24-hours-a-day exposed for two months it is estimated that you have a 50% chance of being infected).

To more fully picture the condition, the symptoms of active tuberculosis include:

– A cough which may last three or more weeks and may produce discolored or bloody sputum
– Unintended weight loss
– Fatigue
– Slight fever
– Night sweats
– Chills
– Loss of appetite
– Pain with breathing or coughing (pleurisy)

That Spinoza may have contracted tuberculosis from his father (or other family members), and may himself have become symptomatic in the year 1656 or so is not something that many people have considered. (To his credit, Nadler does momentarily bring up the idea that Spinoza may have suffered from the same thing that killed his step-mother (Spinoza: A Life, 155); why he notes the step-mother and not his father I do not know. These are years that we have very little historical record of, and a struggle with the illness may very well be a reason for this (the highest risk for developing of the disease is in the first two years after infection). When Spinoza applied for orphan status in March of ’56 (two years after his father died), and when the cherem is read against him in July of the same year, removing him from the community, having failed to pay the family firm’s imposta tax, he may indeed already have been tubercular, and perhaps even seriously so. This would make his excommunication something of a quarantine, not only of ideas, but also in a vividness of metaphor, of body and illness. A cutting off of an already diseased limb. We really need not go that far, though it should be considered. We have had such a variety of motivations projected onto Spinoza and his situation at this time, from Jonathan Israel’s thought that Spinoza was during this period attempting to be excommunicated by being outrageous simply to climb out from the burden of onerous debts, to Wim Klever’s notion that Spinoza at this point was so invested in his political and spiritual education with Van den Enden, long broken from the community, the excommunication was but a trifle. Either of these may be so, but if Spinoza had by now become symptomatic, his illness certainly would have played into his inability to run the firm to profit, or more significantly, his desire to no longer conduct that kind of vigorous business or to remain in the community 0f his youth. No matter the thesis for his excommunication and his change of attitude towards the values in life, the facts of an onset of a lethal diseased that might have killed many of his family members certainly would play an informing role.

Chekhov’s Example

Tuberculosis does not always head in a straight line, by my understanding. It can be recurrent. Chekov, for instance, who like Spinoza also suffered from the disease over a twenty-year period. A first onset expressed itself in an initial bout of fevers in December of 1883, and then three days of coughing up blood a year later in December of 1884. It was not until six years after these, from the strain of trans-Siberian travel, that again the disease seemed to surface, much more forcefully. Chekhov, like Spinoza, died in his 44th year, at the peak of his intellectual and creative powers. [Citing “Chekhov’s Chronic Tuberculosis” (1963), by Brian R. Clarke]. This is how one medical information website describes the nature of the disease’s chronic mechanism:

In addition, TB can spread to other parts of the body. The body’s immune (defense) system, however, can fight off the infection and stop the bacteria from spreading. The immune system does so ultimately by forming scar tissue around the TB bacteria and isolating it from the rest of the body. Tuberculosis that occurs after initial exposure to the bacteria is often referred to as primary TB. If the body is able to form scar tissue (fibrosis) around the TB bacteria, then the infection is contained in an inactive state. Such an individual typically has no symptoms and cannot spread TB to other people. The scar tissue and lymph nodes may eventually harden, like stone, due to the process of calcification of the scars (deposition of calcium from the bloodstream in the scar tissue). These scars often appear on x-rays and imaging studies like round marbles and are referred to as a granuloma. If these scars do not show any evidence of calcium on x-ray, they can be difficult to distinguish from cancer.

Sometimes, however, the body’s immune system becomes weakened, and the TB bacteria break through the scar tissue and can cause active disease, referred to as reactivation tuberculosis or secondary TB. For example, the immune system can be weakened by old age, the development of another infection or a cancer, or certain medications such as cortisone, anticancer drugs, or certain medications used to treat arthritis or inflammatory bowel disease. The breakthrough of bacteria can result in a recurrence of the pneumonia and a spread of TB to other locations in the body. The kidneys, bone, and lining of the brain and spinal cord (meninges) are the most common sites affected by the spread of TB beyond the lungs.

“experience had taught me”

At the very least, if Spinoza was showing symptoms of the disease as early as 1656, as Colerus’ very rough estimate would place them, Spinoza’s life decisions to not pursue wealth, but rather a life of philosophy, must be cast in a slightly different psychological light. Spinoza writes of his change of mind in The Emendation of the Intellect:

After experience had taught me that all the usual surroundings of social life are vain and futile; seeing that none of the objects of my fears contained in themselves anything either good or bad, except in so far as the mind is affected by them, I finally resolved to inquire whether there might be some real good having power to communicate itself, which would affect the mind singly, to the exclusion of all else; whether, in fact, there might be anything of which the discovery and attainment would enable me to enjoy continuous, supreme, and unending happiness.

I say “I finally resolved,” for at first sight it seemed unwise willingly to lose hold on what was sure for the sake of something then uncertain. I could see the benefits which are acquired through fame and riches, and that I should be obliged to abandon the quest of such objects, if I seriously devoted myself to the search for something different and new. I perceived that if true happiness chanced to be placed in the former I should necessarily miss it; while if, on the other hand, it were not so placed, and I gave them my whole attention, I should equally fail (Elwes translation).

This is thought to have been Spinoza’s earliest philosophical text, before the Short Treatise, Shirley placing its composition between the years 1657 and 1660. What, we may ask, was this “experience” that has taught Spinoza the futility of social life, the uncertainty of “fame and riches”. Are these generic experiences that all of us would have, or perhaps the particularities of watching his father die in tubercular fashion, after a life of substantial monetary and honorific gain? Or, more jarringly, was it the onset of the same disease, the same coughing up of blood, that he had seen his father and his step-mother succumb to? This would certainly have a life-turning effect. Spinoza continues in the opening of the Emendation, actually referencing the analogy of fatal illness and remedy as the very mode of his decision making:

For I saw that my situation was one of great peril and I was obliged to seek a remedy with all my might, however uncertain it might be, like a sick man suffering from a fatal malady, who, foreseeing certain death unless a remedy is forthcoming, is forced to seek it, for therein lies all his hope (Shirley translation).

Is this just a proximate reference, or is Spinoza speaking literally of his own onset of illness?

We see no evidence for debilitation in April of ’55 in the record of Spinoza’s subpoena and physical confrontation with the Alvares brothers. He is struck so hard his hat comes off, something which might afford a reference to physical weakness, but none is mentioned. In fact, from the vague description it seems that only the hat seems worse for wear, leaving the impression of a firm man. And in ’58, from Fra Tomás’ 1659 report to the Spanish Inquisition, we find Spinoza to have a handsome face “de buena cara” with light, clear, but perhaps pale skin, blanco. This would seem to put him in good health. The only thing I would mention is that in this report there is great contrast given between his very dark hair and eyes, and the paleness of his skin. Prado, in whose company Spinoza is in, has a “brownish” complexion on the other hand. While he may have been in good health at the time, the paleness of his skin may have been due to some convalescence. In 1659 he is described by another informant for the Inquisition as having a “well-formed body, thin, long black hair, a small moustache of the same color, a beautiful face”.

Yet as we have seen from the example of Chekhov, an attack of tuberculosis does not necessarily leave one debilitated for life. The body’s immune system can indeed isolate the infection, and return one to health, even robust health, only to be susceptible to the disease later, at times of great stress or weakness. Assuming that his disease was that of tuberculosis, one cannot conclude that Spinoza’s health was never robust, as some have thought.

The Beginnings of “Isolation” and a Conserve of Roses

A great deal of investigative imagination and analysis has gone into the question as to why Spinoza left Amsterdam for the much more quiet Rijnsburg in 1661. Gullan-Whur suspects that something had frightened Spinoza in a way that the excommunication had not, perhaps something to do with the Spanish Inquisition. Perhaps an increasing pressure from Dutch authorities and Jewish reaction made it unsafe for Spinoza to continue his Amsterdam life, some feel. And there is the account of a knife attack outside the theatre, if it is to be believed. Alternately, some think that he went to Rijnsburg to be closer to the Collegiant movement. Spinoza’s very good, generous friend Jarig Jelles bought a large new house on the Herengracht in Amsterdam in 1660, but Spinoza did not move in. First he moved to near  “near ” Ouderkerk, and then to Rijnsburg near Leiden’s university. Why? It is mentioned that his move towards isolation was so that he could be away from distractions from friends, so that he could concentrate on his work, and this is no doubt true. But is it too much to notice that his withdrawal from friends and the air of the city may have been really a question of health? Was it not that tuberculosis struck him again, and it is was in full view of his mortality, and even questions of contagiousness, a theoretical need for fresh air, that brought him to concentrated isolation?

By September 1661 he writes to Oldenburg that his Short Treatise, (one may say his most overtly spiritual work) is still a work in progress. There is no hint of his illness in their correspondence. In the winter of ’62/’63 he has the company of Johannes Caesarius, who is living with him, helping him in a none-too-satisfactory fashion with the geometrical treatment of Descartes’ philosophy. Gullan-Whur reads Caesarius to be Jan Casier, a student of Van den Enden’s school, now a young, Dutch Reformed ordinand (1642-77). As a collaborative biographical note of perhaps significant correspondence during this period, Adriaan Koerbagh, Spinoza’s friend and comrade in spirit of the same age, had received his doctor of medicine from nearby Leiden University in 1659, with a dissertation on the causes of Tuberculosis, Disputio medica unauguralis de Phthisi. In 1661, the year that Spinoza moved to Rijnsburg, Koerbagh became a Doctor of Law, again at nearby Leiden, and in Koerbagh’s later political trial he admits that he had discussed philosophical matters with Spinoza numerous times in the years 1661-63. Having conducted a study of the causes of tuberculosis, one wonders if Koerbagh had ever seen Spinoza as a patient. Or if Adriaan himself had tuberculosis which weakened him (as he would died only within a few months of being sentenced to prison and hard labor in 1669). Along this thin line of argument, is it a coincidence that a conserve of roses is the only conserve mentioned in Koerbagh’s Bloemhof  (1668). The suppressed Bloemhof  was a 672 page dictionary of terms written by Adriaan and his brother, meant to demystify the use of foreign phrases and technical jargon, putting into the vernacular the verbal obfuscations by which eclesiastical, medical and legal “experts” carried out much of its authority over the common man. In June 1665 it is for a conserve of roses that Spinoza says he is waiting (Letter 28), writing to the physician Johan Bouwmeester who was an intimate of Adriaan Koerbagh. Spinoza had visited his friends in Amsterdam earlier in the year, and during his visit to the city he seems to have suffered a recurrence of his tuberculosis:

At the same time I also expected some of the conserve of roses which you promised, although now for a long time felt better. On leaving there, I opened a vein once, but the fever did not abate (although I was somewhat more active even before the bloodletting because of the change of air, I think). But I suffered two or three times with tertian fever, though by good diet I have at last rid myself of it and sent it packing. Where it went I know not, but I don’t want it back.

At this time Spinoza has just moved from Rijnsburg to Voorborg near the Hague. Likely having finished first drafts of parts I and II of a then tripart Ethica, he makes a break and begins his work on the Politico-Theological Treatise. Spinoza distinctly associates the “air” of Amsterdam with the onset of his illness. It would appear likely that this causal belief was consistent in his life, and thus part of his reason for moving out of Amsterdam in the first place. One can also ask, something I’ve not seen considered, was the renewed attack of his disease in some way linked to the much discussed break from the Ethics, and his turn to political issues of the day?

Voorburg, Not So Quiet

At this point I would like to take up some of the psychological criticism aimed at Spinoza by his biographer Gullan-Whur. In making her assessment of a certain flaw in Spinoza’s self-perception she provides us with a rather telling description of the house Spinoza moved into in Voorburg. She points out that although Spinoza, in her opinion, plays the role of the isolated sage, being crankily troubled by intrusions, he moved into one of the most bustling, connected locations in all of Voorburg:

Voorburg was a rural village, but Benedictus had not chosen to live in a peaceful part of it, for the Kerkstraat houses, huddled on a terrace and generally having only a gable loft above their ground floors, were flanked by the market place and a boat-servicing harbour beside the Vliet. Yet, whole this lodging was feverishly cacophonous compared with sleepy Katwijkerlaan, he never complained…nothing was easier that getting to any Dutch city from Voorburg. The philosopher could leave home almost at the ringing of the horse-boy’s bell to catch the trekschuit. Voorburg being on the way to everywhere (the canal system joined the River Schie at Delft, and continued south to Rotterdam and Dordrecht), he should have foreseen a continuous flow of callers (154-155)

She goes onto conclude that Spinoza himself does not own up to his own emotional needs for company, caught up in the production of his own image. I might suggest that Gullan-Whur has severely misread Spinoza’s contradictory needs for isolation and for contact. This essentially is the mindset of the chronically, if sporatically, ill. Rather than this being a profound conflict of conscience, or the inability for Spinoza to understand his own needs, Spinoza’s tuberculosis and his philosophical/scientific endeavours required both isolation and contact. Indeed I would suggest that it was likely the disease that forced Spinoza to reconsider his life, and it was this ever-present relationship to his own body and mortality that made his rationalist philosophy most concerned with the freedoms of the body. Gullan-Whur’s example of reading the man is actually instructive for all interpretations which ignore his physical histories. In fact Iwould think that all of Spinoza’s metaphysical positions on the body should benefit from being seen in the light of  a possible continual threat and experience of tuberculosis. 


It is persuasive to infer, and least as persuasive as any other reasoning I have encountered, that Spinoza’s father and step-mother indeed died of tuberculosis, and that Spinoza had contracted the illness from them. On average, people have a 50 % chance of becoming infected with tuberculosis if they are in close contact eight hours a day for six months. If Colerus’s estimate is right that Spinoza had struggled with the disease for more than twenty years, this would put his first attack right at the decisive years of the late 50s, as Spinoza was forming his new political and theological relationships with Van den Enden and Prado, leaving behind the family business. (By stating this length as more than 20 years, Colerus at the very least seems to want to place the illness before Spinoza’s milestone move from Amsterdam.) This encounter with a disease that may have killed his father and step-mother surely would have shaped the decisions Spinoza was making. And the resultant dedication to philosophy, science and selective isolation should not be considered outside of this persistent awareness of both his disease and the effects it may have had on others. All the complexities of influence that we can convincingly conjure up may very well pale to the experience of the fatal fever and cough a year after you watched your father and step-mother, and perhaps even sister, pass under similar conditions. It is agreed that this is a time of plagues, and the death of family members and close friends, certainly by 1664 was not uncommon. This does not mitigate the personal effect the disease would have had upon Spinoza in the determinative years of 1655-1658, not to mention the consequences of managing the disease over a lifetime.

Why the timing and substance of the disease has not been well considered by biographers and interpreters of Spinoza’s life, I do not quite understand, except for the recognizable need to comprehend the man in terms of much vaster, more abstract historical and intellectual factors.

The Number of Jewish Merchants in 17th Century Amsterdam

From Johanthan Israel’s Empires and Entrepots: The Dutch and the Spanish Monarchy and the Jews, 1585-1713:

The Number of Dutch Jewish Depositors with the Amsterdam Exchange Bank 1609-1674 (page 422)

One can see the post-1620 dip in investment which followed the renewal of the Spanish embargo on Dutch shipping to Spanish, Portuguese and Flemish ports. But to give a sense of the importance of merchantile buisness for a people debarred from guilded, retail buisness holdings, in 1620 the entire population of the Sephardic community in Amsterdam was a little over 1,000. This puts the number of depositors at approximently 10% of that population. And the Dutch Jewish population in Recife Brazil in the year 1644 was nearly 1,500, 150% of the Sephardic population of Amsterdam 25 years before.

How Long was Peter Balling’s Son Dead?

Within Reason: A LIfe of Spinoza

I have to say that reading Margaret Gullan-Whur’s biography of Spinoza is such a mixed experience. It is so well-researched, stuffed with details, and those details so creatively composed that I find that page after page I turn to the endnotes in the back to run through her sources, opening up new ways of seeing material that has long rested in a single frame of reference. And I don’t really mind her very speculative tendencies, something which no doubt has bothered many readers who want to keep their personal “Spinoza” intact, for it is her speculative that allows her to open up the new material. But I have to say, along with this speculation comes the quite evident fact that she plain does not like the man she had studied, or, if she does like him, she has irrepressible drive to “humanize” him, that is, to impress upon him every character flaw she can find hint of (or, if I was more reckless, perhaps make him in the image of some very memorable male figure in her own life). One need only look to her interpretation of Spinoza 26 to Oldenburg, which is pretty much plainly filled with glee and enthusiasm over a meeting with Huygens, to see how deeply she will insert values of arrogance and resentment into a historical Spinoza. I am all for remaking Spinoza for too often he becomes more like a Personage rather than a person, but Gullan-Whur seems strained to find a particular kind of person. Be that as it may, I have to recommend the wonderful biography to anyone serious about building a clearer picture of the man, his world and his life.

The Death of a Son

As an example of what I find fascinating is the way that Gullan-Whur is able to re-contextualize material that felt pretty well settled in my mind. I take for instance his letter to Peter Balling (letter 17). I had always, as had many, taken this letter to be prima facie a letter of consolation to a mourning father. Spinoza’s reported waking dream of the Brazilian and his thoughts on prophetic knowing and immortality that follow were to be seen in the light of Peter’s recent loss of a son, probably to the plague. I don’t know if the research or interpretation is original to her (she cites only official records, and no article), but challengingly Gullan-Whur points out that there is only one record of the death of a son of Peter Balling:

Peter Balling’s omens could have concerned things other than his little boy’s death (which may not have been recent: the only record of the burial of a “child Peter Balling” is for 16 October 1661), since one “Pieter Balling”, living on the Burghwal opposite the Swan Brewery was buried  on 23 December 1664, in an emergency graveyard in the grounds of an old monastery, fourteen guilders being paid for the beir and boat-cover used for his brief obsequies (152).

Of course the original, widespred interpretation of the Balling letter remains quite possible. Deaths were very frequent at this time, and Balling may have had several other children who died. The sense that Balling has been spooked by his auditory premonition of his son’s rasping still can be in order, as the plague was in full-bloom in July of 1664 when Spinoza writes to him, and Peter’s death just five months later becomes a kind of tragic fulfillment. But what this tidbit of historical evidence does is inspire a closer look at the letter, the possibility to see it in another light. Nowhere does Spinoza’s words specify a recent death, and if Balling is recalling a premonition and fulfillment Read more of this post

Spinoza and Diamond Polishing?

What was Spinoza’s Relationship to the Gem and Diamond Trade

I post here a portion of a hard to find book, in the interest of establishing a baseline of information for others. Because this site has involved a variety of hypotheses on the kinds of influences Spinoza may have had, all should be sketched out as best we can. Among my thoughts as to the mystery of where Spinoza may have learned his lens-grinding craft, apart from any guild commitment, it occurs to me that he may have learned it, at least in part, through his involvement with the diamond trade. There is some evidence that Spinoza had dealings with gem dealers in the years 1655-56, in fact the scuffle and suit of Antonij Alverez shows that he and likely his family business had dealings with one of the largest Amsterdam diamond trade names, Duarte. Whether this engagement with the gem business led his curious mind into learning about the process of gem and diamond polishing from which he may have taken valuable techniques into his lens-grinding (using diamond dust as an abrasive) at this point we cannot say. All we can do is put the fact that Spinoza had unique skills, techniques and likely instruments for lens-polishing, as testified by Christiaan Huygens, and speculate if these come from an origin that would be specific to his Jewish community. These may have been techniques specific to gem polishing, a process which the Jews of Amsterdam predominately came to rule over, or they may have been specific to Jewish lens-grinding. In either case it may serve us well to lay out the facts of Jewish diamond trade during Spinoza’s young adulthood. At the very least such facts give us a broader picture of the time and place Spinoza grew up in, and one of the lathe-processes he would have at least in a cursory fashion been exposed to.

Jews of the Diamond City

The extensive quote below is from Jews of the Diamond City – Amsterdam (1988), put out by the Harry Oppenheimer Diamond Museum:

We hear of Jewish masterpolishers only from 1611 onwards. A notarial certificate from the year deals with a contract between Jewish diamond polishers who were trained by gentiles. A document dated 1615 mentions that one named Solomon Franco had finished his apprenticeship as diamond polisher with a certain craftsman named David Bolshnik. Additional sources in the first quarter of the 17th Century inform us about another dozen names belonging to Jews of Portuguese origin who were experts in diamond polishing. As a rule these craftsmen were poorer distant relatives of the merchants who imported the rough stones thus ensuring themselves employment and a decent income. For example, we know about the two famous families – Correal and Duarte de Paz – who gained their reputation as jewelers and diamond polishers in the 17th Century.

The waves of Jews who fled persecution from Germany and later the Jews who fled Poland and Lithuania after the massacres of 1648/9 lead to an influx of refugees lacking in means and profession to Amsterdam. Consequently, the social structure of the diamond industry underwent a gradual change; the Portuguese traders, the polishers and the jewelers became production managers who provided work for their Ashkenazi brethren who, to an increasing degree, constituted the working class.

In spite of the scant documentation of the period, it seems that the Portuguese Jews preferred their “Pollak” brothers over their gentile fellow-workers. It was their intention to teach them an “honorable” trade which would provide them with a reasonable income and standard of living.

Copper Etching Jan Luken (1690)

copper etching, Jan Luyken (1690)

It is interesting to consider what Jews saw in the polishing trade that made it so attractive to them. On a copper engraving by the Flemish artist Jan Luyken (1649-1712) a typical diamond polishing workshop is shown. It was a rather small room, dark and stiffling. The polisher stands near the polishing wheel and places the stone on the leaden head at the end of the polishing handle. Time and again he changes the position of the stone, each time choosing a different angle on the spinning iron wheel coated with diamond dust. The rotation of the wheel is affected by a transmission belt connected to a horizontal drive wheel.

A notarial certificate dated 1615 mentions that the Portuguese Jews employed gentile women to rotated the drive wheel; this it the first written testimony to a female work force in the diamond industry.

The Jewish polishers of Ashkenazi origin who were unable to employ gentile women had to employ their own wives and children to operate the wheel. Thus, day to day, from dawn to nightfall, the whole family labored 12 to 15 hours a day to make a living.

The diamond polishers in general, worked independently and received the raw material from the diamond traders. Their wages were determined according to a variable tariff based on the weight and quality of the rough stone, the form of the finished product and the quality of his work. However, these tariffs were also subject to supply and demand…

…Among all the occupations that flourished in the Jewish quarter of Amsterdam, such as peddling, printing, dispensing and others, the trade of “Diamond-schleifer” – Yiddish and Ladino word for diamond polisher -became “The Trade.” Every Jewish mother strived for her son to learn this trade which ensured him a secure future, a good livelihood and economic independence, but, above all, great mobility on the social scale.

To become a craftsman required a very high tuition fee (69-225 florins) collected by the master polisher. The training period to be an expert in all the stages of processing in the old fashionable shapes (heart, almond, rose-cut and brilliant), lasting from 15 months to four and a half-years.

Rough stones of good quality required only few preparatory stages before the polishing process: cleaving or sawing, (dividing the stone in two), and cutting, (rounding off the base). These operations were also taught by the master and only towards the 18th century can one observe the specialization in ancillary trades connected with the polishing (44-45), (Simona Edelman).

What We May Be Able To Glean

Aside from the thin hypothesis that Spinoza have have learned something from the diamond polishers of his community, there are significant facts in this brief piece. Unfortunately the text is not footnoted, so it is unclear what is an author’s conjecture and what has foundation. There is the idea that the Sephardic Jews had learned this trade from gentiles in the early part of the 17th century in Amsterdam. Henriëtte Boas places these to be Huguenot refugee’s from Antwerp, establishing one more Jewish and Protestant Reform attachment. (Yet I have also read that these techniques likely arose through a direct transmission with India, from whence the diamonds came.) Next we have a cost and a timetable set out for learning the trade. This gives clue to a non-guilded craft relationship, and may reflect upon lens-grinding as well. It is helpful to know that in 15 months a skill such as this one could be acquired for a fee. Interesting is the shift in labor distribution in the decade leading to Spinoza’s majority, as Ashkenazi started to form a “working class” in the diamond trade. One wonders if such an influx may have also opened the door to Spinoza learning lens-grinding in his community outside of the usual transmissions of knowledge, since economic relationships were changing. Additionally, we hear of the diamond dust and flat iron wheel, a material technique not mentioned in any of the lens-polishing techniques I have read in the period. Could it be that there is some improvement offered by this means? The leaded head in diamond grinding (pictured below), actually presents a semi-automated system of grinding that pre-dates any assisted lens-grinding of the time. Could the diamond-polisher’s example, (aided by the fact that he needed to make plane-cuts, and not spherical), have been the inspiration for some of the semi-automated ideas for lens-grinding, such as those by Christian Huygens, D’Orleans and Hooke? (And, is Spinoza’s rejection of assisted polishing related to the spherical shape itself, feeling that the hand bests can feel a spherical relation?). And lastly, the wheel is quite distinct from a lens-grinder’s wheel, in that the grinding is done at the edge, and not in a bowl form. Would this kind of wheel use have helped grind certain small sized lenses? Enough with the conjecture for the moment.

Jewish polisher, late 1800s

Jewish polisher, late 1800s

Anti-Trinitarian Politics at the Time of Spinoza’s Collegiants

For those interested in a summation of the political difficulties facing Spinoza’s group of Collegiants, here is an excerpt from Jonathan Israel’s The Dutch Republic: Its Rise, Greatness and Fall (1477 – 1806). In all likelihood Spinoza’s circle organized itself around the political protestor, Latin instructor, physician and playwright Van den Enden, and the bookshop of Rieuwertsz, who would publish, among other things, Spinoza’s study of Descartes’ Principles of Phllosophy and his Theological-Political Treatise.


Menno Simon (1496 -1561)

Fausto Sozzini (1539 – 1604)

Israel writes:

“But it [the centrality of the Socinian issue] was also due to the spread of the Collegiant movement, especially in the 1640s, to Amsterdam, and mounting evidence that some Dutchmen were being influenced by Socinian doctrines. Zeeland had already acted by the time the North and South Holland Synods petitioned the States of Holland, in 1653, to combat this ‘sickness’, which they called the most dangerous, and most ‘Jewish’, of all Christian heresies, alleging that it was spreading rapidly, especially in Holland, Friesland, and Groningen, and indication that Mennonites were regarded as particularly susceptable to Socinian arguments.

“In September 1653, the States of Holland duly prohibited Socinian and other anti-Trinitarian ‘conventricles’, warning participants they would be charged with blasphemy and as ‘disturbers of the peace’. Booksellers found stocking anti-Trinitarian books were to be fined 1000 guilders [a day laborer made about a guilder a day], printers of anti-Trinitarian literature 3000 guilders. The edict was aimed at Collegiants, and others who were susceptible to anti-Trinitarian influences, as well as avowed Scocinians, meeting in groups. There was a crackdown on anti-Trinitarianism throughout Holland, as well as in neighboring Utrecht, which continued through the 1650s and undoubtably had a considerable effect….At Amsterdam, too, the Collegiants were for some years forced to meet in smaller groups, than before, private homes, and be more circumspect….The crackdown on anti-Trinitarianism extended also to the countryside. The baljuw of Alkmaar wrote to De Witt, in March 1655, reporting his enquiries in the villages around the city, with the help of the ‘regents of the principal villages’, as to whether there were any Scocinians, or anti-Trinitarian books, in the vinciity, concluding that there were not…

…At Amsterdam, it proved impossible to halt the flow of Socinian publications for long…Collegiant meetings in large groups, or ‘colleges’, revived in the early 1660s [Spinoza moved to Rijnsburg in mid 1661]. In 1661, the Amsterdam Reformed consistory complained to the vroedschap of the ‘exorbitance of the Socinian gatherings, in which Quakers and Boreelists mingled, such that one hundred, one hundred fify, and sometimes even greater numbers attended them’. What was at issue here was not the existence of the Collegiant groups, as such, but that there was no longer sufficient pressure to compel them to meet only in small groups, in private homes” (911 – 912) [without footnotes].

Professor Israel does not take into immediate account that the consistory’s claim is likely an exaggeration, so as to make the complaint more forceful, but it is notable that by the time of Spinoza’s move to Collegiant center Rijnsburg, College gatherings in Amsterdam appeared to have bloomed to rather large numbers.


Franciscus van den Enden: Spinoza’s Latin Teacher

A website dedicated to the life and works of Spinoza’s Amsterdam teacher of Latin, no doubt he who introduced him to the plays of Seneca and Terence and many of a political circle. Filled with notable details, primary sources and histories. A thinker whose influence on Spinoza is yet calculable:

Franciscus van den Enden