Theologicae regulae

Every predication made concerning the Creator is coupled and conjoined.

This rule descends from the one already touched on, because if one and the same thing is predicated by the aforesaid terms of God, coupled and conjoined is the predication, because when any term is predicated of him, nothing is left outside that predication: for I say as much when I say: God is good; as if I said: God is God good, strong, pious. Concerning a creature, however, nothing is set down in a coupled way, but separately. For when it is said, Peter is just, although something is predicated, yet many things are left outside this predication which belong to Peter, which are predicated of him by other terms, as when I say, Peter is pious, merciful. Whence Boethius in the book On the Trinitysays: Separately indeed in other things, but in God distinctly and yet coupled, in this way. For when we say: substance is man or is God, it is said as though that of which it is itself predicated is substance; as substance man, or God; but it differs; since man is not entirely himself man: and for this reason not substance either: for what he is, he owes to other things, which are not man. But God is this very thing which he is, God: for he is nothing else but what he is.