Baruch Spinoza
Baruch (Benedictus de) Spinoza (1632–1677) was a Portuguese-Dutch philosopher of the Amsterdam Sephardic-Jewish community, one of the great 17th-century rationalists. Expelled from his Jewish community by herem (excommunication) in 1656 for his heterodox views, he lived quietly grinding optical lenses and published sparingly to avoid persecution; his masterwork appeared posthumously. Rebecca Goldstein called him “the renegade Jew who gave us modernity.”
Core ideas
- Substance monism — Deus sive Natura. In the Ethics, there is only one infinite substance, “God or Nature.” Everything that exists is a mode of this single substance; mind and matter are two of its attributes, not two separate things. This is a direct answer to Descartes’ dualism — Spinoza keeps the rationalism, drops the two substances.
- The geometric method. The Ethics is written more geometrico — definitions, axioms, propositions, proofs — treating metaphysics like Euclid, the rationalist faith that reality is transparent to deductive reason.
- Mind–body parallelism & determinism. Mind and body are the same thing under two attributes, running in parallel (no causal crossing needed). Everything follows necessarily from God/Nature’s nature — a thoroughgoing determinism; human freedom is understanding that necessity, not escaping it.
- Bible criticism & the secular state. The Tractatus Theologico-Politicus questioned the divine authorship of scripture and argued ecclesiastical authority should have no role in a secular, democratic state — a founding text of secular political thought.
In the conversation
Spinoza is the rationalist who collapses Descartes’ two substances into one, dissolving the mind–body gap by making mind and body two faces of a single reality. His God-or-Nature reads variously as pantheist, panentheist, or atheist. Source: Wikipedia (T2, tertiary — page the Ethics directly for depth).
Related
rationalism · mind-body-problem · rene-descartes · western-philosophy