E1P18D
Demonstration — Part I
Latin
Omnia quæ sunt, in Deo sunt et per Deum concipi debent (per propositionem 15) adeoque (per corollarium I propositionis 16 hujus) Deus rerum quæ in ipso sunt, est causa, quod est primum. Deinde extra Deum nulla potest dari substantia (per propositionem 14) hoc est (per definitionem 3) res quæ extra Deum in se sit, quod erat secundum. Deus ergo est omnium rerum causa immanens, non vero transiens. Q.E.D.
English (Elwes 1883)
All things which are, are in God, and must be conceived through God (by Prop. xv.), therefore (by Prop. xvi., Coroll. i.) God is the cause of those things which are in him. This is our first point. Further, besides God there can be no substance (by Prop. xiv.), that is nothing in itself external to God. This is our second point. God, therefore, is the indwelling and not the transient cause of all things. Q.E.D.
Modern English
Everything that exists is in God and must be conceived through God (E1P15); so (E1P16C1) God is the cause of the things that are in him. That is the first point. Next, no substance can be given outside God (E1P14), that is, (E1D3), no thing that is in itself outside God. That was the second point. Therefore God is the immanent cause of all things, not the transitive cause. Q.E.D.