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Dutch rationalist philosopher
Baruch (Benedict) de Spinoza (1632–1677) was a Dutch philosopher of Portuguese-Jewish origin whose posthumously published Ethics (1677) presented a complete metaphysical system in the form of geometric proofs — definitions, axioms, propositions, and demonstrations modeled on Euclid's Elements.12 He argued that God and Nature are a single substance with infinite attributes, a position that made him one of the most controversial thinkers in Europe and got every one of his major works banned by the Catholic Church and the States of Holland.13
Spinoza was born on November 24, 1632, in Amsterdam to Michael de Spinoza and Hana Debora, members of the Portuguese-Jewish community that had settled in the Dutch Republic to escape the Inquisition.13 His family spoke Portuguese at home; he was educated in Hebrew, Spanish, Dutch, and later Latin.1 He attended the Talmud Torah school of the Amsterdam Sephardic community, where he studied Hebrew scripture, Talmud, and medieval Jewish philosophy, particularly Maimonides.12
His mother died when he was six, and his father, a successful merchant, died in 1654.1 Spinoza briefly ran the family importing business before abandoning commerce entirely.1
On July 27, 1656, the Amsterdam Portuguese-Jewish community issued a cherem (ban of excommunication) against Spinoza at the age of 23.12 The document, written in Portuguese, condemned him with unusually harsh language: "Cursed be he by day and cursed be he by night; cursed be he when he lies down and cursed be he when he rises up."1 The synagogue records do not specify his offenses, but scholars believe they related to his denial of the immortality of the soul, his rejection of a providential God, and possibly his claim that the Torah was not divinely authored.12
After the ban, Spinoza adopted the Latin name Benedict (both "Baruch" and "Benedict" mean "blessed").1 He never sought readmission and had no further contact with the Jewish community.1
To support himself, Spinoza became an optical lens grinder and instrument maker — a skilled trade that also connected him to the scientific community of the Dutch Golden Age.13 He ground lenses for microscopes and telescopes, and his work was praised by Christiaan Huygens, who in 1665 described Spinoza's lenses as superior to those made by professional craftsmen in London.1 The glass dust he inhaled daily likely contributed to the lung disease that killed him at 44.13
The central claim of Spinoza's metaphysics is that there exists exactly one substance, which he called "God or Nature" (Deus sive Natura).24 A substance, in his definition, is that which exists in itself and is conceived through itself — it depends on nothing else for its existence or intelligibility.25 From this he deduced that there cannot be two substances of the same nature (since they would be indistinguishable) and that the one substance must possess infinite attributes, of which humans perceive two: thought and extension (the physical).25
This means that minds and bodies are not two different kinds of thing interacting (as Descartes held) but two ways of describing the same underlying reality.24 Every physical event has a corresponding mental aspect, and vice versa — a position now called "dual-aspect monism" or "neutral monism."2
Spinoza denied free will in the conventional sense.24 He argued that every event, including every human thought and action, follows necessarily from prior causes according to the laws of nature — which are identical with the laws of God, since God and Nature are the same thing.25 People believe they are free, he wrote, only because they are conscious of their desires but ignorant of the causes that determine those desires.2
Freedom, for Spinoza, does not mean acting without cause but acting from the necessity of one's own nature rather than being driven by external forces.25 A person becomes freer by understanding the causal chains that govern their emotions — what he called "adequate ideas" — thereby transforming passive affects (emotions suffered) into active affects (emotions understood).25
Books III through V of the Ethics contain what amounts to a systematic psychology of the emotions.5 Spinoza classified all emotions as derivatives of three primary affects: desire (cupiditas), joy (laetitia), and sadness (tristitia).25 He defined each emotion geometrically — jealousy, for example, is "a wavering of the mind arising from love and hatred together, accompanied by the idea of a rival."5
His ethical program is built on this framework: since joy arises from an increase in one's power of acting and sadness from a decrease, the rational person seeks to maximize understanding (the greatest source of joy) and minimize bondage to confused, passive emotions.25 The highest human good is what he called the "intellectual love of God" (amor Dei intellectualis) — the mind's intuitive understanding of itself and all things as modes of the one substance.25
Published anonymously in 1670 with a false Amsterdam imprint, the Theologico-Political Treatise was the only major work Spinoza published during his lifetime under semi-public conditions.13 In it he argued that the Bible should be interpreted using the same historical and philological methods applied to any ancient text, that prophets were distinguished by vivid imagination rather than superior intellect, and that the purpose of scripture is to teach obedience and piety rather than philosophical truth.12
The book's political chapters defended freedom of thought and expression as essential to a stable republic.12 Spinoza argued that a state that suppresses opinion breeds hypocrisy and resentment, while one that tolerates dissent channels disagreement into open debate.2 The Dutch Reformed Church condemned the book as "blasphemous and soul-destroying," and in 1674 the States of Holland formally banned it alongside Thomas Hobbes's Leviathan.13
Spinoza died on February 21, 1677, in The Hague, at age 44, from a lung disease consistent with silicosis caused by years of inhaling fine glass particles.13 His landlord, the painter Hendrik van der Spyck, found him dead in his room.1 Within months, his friends published his Opera Posthuma, containing the Ethics, the unfinished Political Treatise, the Treatise on the Emendation of the Intellect, and his correspondence.1
For a century after his death, "Spinozism" was used almost exclusively as a term of abuse, roughly synonymous with atheism.13 The German Enlightenment rehabilitated him: Lessing reportedly told Friedrich Jacobi in 1780 that "there is no other philosophy than the philosophy of Spinoza," and Goethe called the Ethics the work that most closely matched his own worldview.14 Hegel described Spinoza's system as the essential starting point of all modern philosophy.1 In the twentieth century, Gilles Deleuze devoted two books to Spinoza's thought, and neuroscientist Antonio Damasio titled his 2003 study of emotion and reason Looking for Spinoza, arguing that Spinoza anticipated key findings of affective neuroscience by three centuries.14
Baruch (Benedict) de Spinoza (1632–1677) was a Dutch philosopher of Portuguese-Jewish origin whose posthumously published Ethics (1677) presented a complete metaphysical system in the form of geometric proofs — definitions, axioms, propositions, and demonstrations modeled on Euclid's Elements.12 He argued that God and Nature are a single substance with infinite attributes, a position that made him one of the most controversial thinkers in Europe and got every one of his major works banned by the Catholic Church and the States of Holland.13
Spinoza was born on November 24, 1632, in Amsterdam to Michael de Spinoza and Hana Debora, members of the Portuguese-Jewish community that had settled in the Dutch Republic to escape the Inquisition.13 His family spoke Portuguese at home; he was educated in Hebrew, Spanish, Dutch, and later Latin.1 He attended the Talmud Torah school of the Amsterdam Sephardic community, where he studied Hebrew scripture, Talmud, and medieval Jewish philosophy, particularly Maimonides.12
His mother died when he was six, and his father, a successful merchant, died in 1654.1 Spinoza briefly ran the family importing business before abandoning commerce entirely.1
On July 27, 1656, the Amsterdam Portuguese-Jewish community issued a cherem (ban of excommunication) against Spinoza at the age of 23.12 The document, written in Portuguese, condemned him with unusually harsh language: "Cursed be he by day and cursed be he by night; cursed be he when he lies down and cursed be he when he rises up."1 The synagogue records do not specify his offenses, but scholars believe they related to his denial of the immortality of the soul, his rejection of a providential God, and possibly his claim that the Torah was not divinely authored.12
After the ban, Spinoza adopted the Latin name Benedict (both "Baruch" and "Benedict" mean "blessed").1 He never sought readmission and had no further contact with the Jewish community.1
To support himself, Spinoza became an optical lens grinder and instrument maker — a skilled trade that also connected him to the scientific community of the Dutch Golden Age.13 He ground lenses for microscopes and telescopes, and his work was praised by Christiaan Huygens, who in 1665 described Spinoza's lenses as superior to those made by professional craftsmen in London.1 The glass dust he inhaled daily likely contributed to the lung disease that killed him at 44.13
The central claim of Spinoza's metaphysics is that there exists exactly one substance, which he called "God or Nature" (Deus sive Natura).24 A substance, in his definition, is that which exists in itself and is conceived through itself — it depends on nothing else for its existence or intelligibility.25 From this he deduced that there cannot be two substances of the same nature (since they would be indistinguishable) and that the one substance must possess infinite attributes, of which humans perceive two: thought and extension (the physical).25
This means that minds and bodies are not two different kinds of thing interacting (as Descartes held) but two ways of describing the same underlying reality.24 Every physical event has a corresponding mental aspect, and vice versa — a position now called "dual-aspect monism" or "neutral monism."2
Spinoza denied free will in the conventional sense.24 He argued that every event, including every human thought and action, follows necessarily from prior causes according to the laws of nature — which are identical with the laws of God, since God and Nature are the same thing.25 People believe they are free, he wrote, only because they are conscious of their desires but ignorant of the causes that determine those desires.2
Freedom, for Spinoza, does not mean acting without cause but acting from the necessity of one's own nature rather than being driven by external forces.25 A person becomes freer by understanding the causal chains that govern their emotions — what he called "adequate ideas" — thereby transforming passive affects (emotions suffered) into active affects (emotions understood).25
Books III through V of the Ethics contain what amounts to a systematic psychology of the emotions.5 Spinoza classified all emotions as derivatives of three primary affects: desire (cupiditas), joy (laetitia), and sadness (tristitia).25 He defined each emotion geometrically — jealousy, for example, is "a wavering of the mind arising from love and hatred together, accompanied by the idea of a rival."5
His ethical program is built on this framework: since joy arises from an increase in one's power of acting and sadness from a decrease, the rational person seeks to maximize understanding (the greatest source of joy) and minimize bondage to confused, passive emotions.25 The highest human good is what he called the "intellectual love of God" (amor Dei intellectualis) — the mind's intuitive understanding of itself and all things as modes of the one substance.25
Published anonymously in 1670 with a false Amsterdam imprint, the Theologico-Political Treatise was the only major work Spinoza published during his lifetime under semi-public conditions.13 In it he argued that the Bible should be interpreted using the same historical and philological methods applied to any ancient text, that prophets were distinguished by vivid imagination rather than superior intellect, and that the purpose of scripture is to teach obedience and piety rather than philosophical truth.12
The book's political chapters defended freedom of thought and expression as essential to a stable republic.12 Spinoza argued that a state that suppresses opinion breeds hypocrisy and resentment, while one that tolerates dissent channels disagreement into open debate.2 The Dutch Reformed Church condemned the book as "blasphemous and soul-destroying," and in 1674 the States of Holland formally banned it alongside Thomas Hobbes's Leviathan.13
Spinoza died on February 21, 1677, in The Hague, at age 44, from a lung disease consistent with silicosis caused by years of inhaling fine glass particles.13 His landlord, the painter Hendrik van der Spyck, found him dead in his room.1 Within months, his friends published his Opera Posthuma, containing the Ethics, the unfinished Political Treatise, the Treatise on the Emendation of the Intellect, and his correspondence.1
For a century after his death, "Spinozism" was used almost exclusively as a term of abuse, roughly synonymous with atheism.13 The German Enlightenment rehabilitated him: Lessing reportedly told Friedrich Jacobi in 1780 that "there is no other philosophy than the philosophy of Spinoza," and Goethe called the Ethics the work that most closely matched his own worldview.14 Hegel described Spinoza's system as the essential starting point of all modern philosophy.1 In the twentieth century, Gilles Deleuze devoted two books to Spinoza's thought, and neuroscientist Antonio Damasio titled his 2003 study of emotion and reason Looking for Spinoza, arguing that Spinoza anticipated key findings of affective neuroscience by three centuries.14
