Translated by Elwes.
, Prop vi.), it must, therefore, be its own cause--that is, its essence necessarily involves existence, or existence belongs to its nature.
VIII. Every substance is necessarily infinite.
>>>>>Proof--There can only be one substance with an identical attribute, and existence follows from its nature (Prop. vii.); its nature, therefore, involves existence, either as finite or infinite. It does not exist as finite, for (by Deff. ii.) it would then be limited by something else of the same kind, which would also necessarily exist (Prop. vii.); and there would be two substances with an identical attribute, which is absurd (Prop. v.). It therefore exists as infinite. Q.E.D.
*****Note I.--As finite existence involves a partial negation, and infinite existence is the absolute affirmation of the given nature, it follows (solely from Prop. vii.) that every substance is necessarily infinite.
*****Note II.--No doubt it will be difficult for those who think about things loosely, and have not
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