Geometry and Deduction
George Henry Lewes — the husband of the first translator of Spinoza’s Ethics into English — tried to explain why Spinoza was wrong to take geometry as a model for metaphysics:
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Geometry never quits the sphere of its first assumption, that its axioms retain their necessary clearness, and its consequences their necessary truth. It begins with lines and surfaces, with lines and surfaces it ends; it is a purely subjective and deductive science (‘Spinoza’s Life and Works’, Fortnightly Review (1843), 214).