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E1P7D

Demonstration — Part I

Latin

Substantia non potest produci ab alio (per corollarium propositionis præcedentis); erit itaque causa sui id est (per definitionem 1) ipsius essentia involvit necessario existentiam sive ad ejus naturam pertinet existere. Q.E.D.

English (Elwes 1883)

Substance cannot be produced by anything external (Corollary, Prop vi.), it must, therefore, be its own cause--that is, its essence necessarily involves existence, or existence belongs to its nature.

Modern English

Substance cannot be produced by anything else (E1P6C). So it must be *causa sui*, that is, (E1D1), its essence necessarily involves existence, or, existence belongs to its nature. Q.E.D.

Depends on (1)

Definitions