EthicsBaruch Spinoza

Spinoza's Ethics is written in geometric order: definitions, axioms, propositions, demonstrations, corollaries, scholia. The form is not decorative. Spinoza believed that the structure of reality could be exhibited with the same necessity as Euclidean geometry, and the Ethics attempts exactly that.

Part I establishes that there is only one substance, which Spinoza calls God or Nature. This substance has infinite attributes, of which we know two: thought and extension. Individual things (minds, bodies, rocks, passions) are modes of this single substance, not independent entities. There is no transcendent creator; God is the immanent cause of all things.

Parts II and III work out the consequences for mind and emotion. Mind and body are not two substances but two expressions of the same reality. The emotions are not disorders of the soul but natural events following from the body's power of acting. Spinoza catalogs them with a taxonomist's precision: desire, joy, sadness, love, hatred, and their compounds.

Parts IV and V turn to ethics proper. Human bondage consists in being determined by external causes we do not understand. Freedom consists in understanding those causes, which transforms passive emotion into active knowledge. The highest good is the intellectual love of God: seeing one's own existence as a necessary expression of the whole.

The Ethics is one of the most self-contained works in the tradition. It asks for no authorities, cites no predecessors, and concedes nothing to common opinion.