Roman Commentary on the Sentences of Peter Lombard 1

Distinction 3.1.1: Whether that God exists is per se known?

Ob 2: What is not able to be thought not to be is per se known. But no one can think that God does not exist, as Anselm says. Therefore, God is per se known. Proof of the middle: God is that than which a great cannot be thought. Either, therefore, God exists only in your "heart" or God exists in your heart and in reality. If only in your heart, then he is not that than which a great cannot be thought, since what exists in reality and in the heart is greater. Similarly, he does not exist in reality alone, because what exists in reality and at the same time also in the heart is greater. Therefore, the same [conclusion] as before [follows].

Ad 2: It should be said that, whatever Anselm says, nevertheless it is possible that God be thought not to exist, just as is held in the Psalm: "the fool said in his heart. . . ." And, there are many who know [sciunt] nothing about God. Also, his argument is not valid because although it is not possible for God to be thought not to exist because nothing can be thought greater than God, on account of this it only follows that God exists in the mind as thought. Or, it should be said that insofar as he is in himself it is per se known that he cannot be thought not to exist.