first, because no other thing can be conceived by me to the essence of which existence belongs, besides God himself; secondly, because I cannot conceive of two or more such Gods, and because, granted that one exists now, I plainly see that it is necessary both that he should have existed for all eternity up to now, and that he will continue to exist for an eternity in the future; and finally, because I perceive many other properties in God of which none can be subtracted or altered by me.