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Ethics 1, by Benedict de Spinoza

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Spinoza’s Ethica ordine geometrico demonstrata (Ethics demonstrated in geometrical order) is based on a deductive method derived from Euclidean geometry. Spinoza maintains that the validity of ethical ideas can be demonstrated by mathematical argument or proof. Spinoza asserts that ethics can be based on a geometric model in which axioms and propositions follow each other with logical necessity. This reflects the view that ethical truth has the same logical necessity as mathematical truth. Spinoza sees ethics as a rational system corresponding to the rational nature of the universe.