-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.
Substantzia ez du beste deusek ekoizten ahal (aitzin. Prop. ond. arab.); beraz, bere baitako kausa izanen da, erran nahi baita (1. Def. arab.) haren esentziak, nahitaez, bere baitan daukala existentzia edo, bestela, haren izaerari dagokiola existitzea.