Appendix: Reasons Which Establish the Existence of God, and the Distinction Between the Mind and Body of Man, Disposed I

To say that an attribute is contained in the nature or in the concept of a thing, is the same as to say that this attribute is true of this thing, and that it may be affirmed to be in it (Definition IX.).

But necessary existence is contained in the nature or in the concept of God (by Axiom X.).

Hence it may with truth be said that necessary existence is in God, or that God exists.

And this syllogism is the same as that of which I made use in my reply to the sixth article of these objections; and its conclusion may be known without proof by those who are free from all prejudice, as has been said in Postulate V. But because it is not so easy to reach so great perspicacity of mind, we shall essay to establish the same thing by other modes