Theologicae regulae

God is one for whom whatever he is, is to be everything that he is.

To this gives credence that rule in which it was said: Monad is, etc. For since God is simple, there is nothing in him except what he himself is, as Boethius says in the book On the Trinity. For in him there is neither diversity of parts, nor plurality of properties. By whatever terms, then, God is shown to be something, one and the same is predicated to be. For "the same" and "one" are set down for these terms, when it is said: God is God, strong, patient, merciful. For it is the same for God to be God, to be strong, to be merciful. Whence Boethius, in the book On the Trinity, says: It is the same for God to be, as to be great. The sense, then, is: God is whatever he is; he is everything that he is, that is, God is that thing of which, by whatever term something is predicated, the same is predicated by all other terms of him. But this is chiefly to be understood of the terms of the three predicaments, of substance, quality, and quantity. Whatever terms, then, of the first, or second, or third predicament are said of God, predicate of him the divine essence, as when it is said: God is God, substance, spirit, pious, merciful, strong, great, immense. Whence, according to this, that rule seems to have been handed down by some: