Thomas Aquinas

“ Now the perfections of things are opposed to each other, for each thing is perfected by its specific difference. But the differences by which "genera" are divided, and "species" constituted, are opposed to each other. Therefore because opposites cannot coexist in the same subject, it seems that the perfections of all things are not in God.
Objection 3: Further, a living thing is more perfect than what merely exists; and an intelligent thing that what merely lives. Therefore life is more perfect than existence; and knowledge than life. But the essence of God is existence itself. ”

“ Although it may be admitted that creatures are in some sort like God, it must nowise be admitted that God is like creatures; because, as Dionysius says (Div. Nom. ix) : "A mutual likeness may be found between things of the same order, but not between a cause and that which caused," For, we say that a statue is like a man, but not conversely; so also a creature can be spoken of as in some sort like God; but not that God is like a creature. ”

“ Now it is plain that the effect pre-exists virtually in the efficient cause: and although the pre-exist in the potentiality of a material cause is to pre-exist in a more imperfect way, since matter as such is imperfect, and an agent as such is perfect still to pre-exist virtually in the efficient cause is to pre-exist not in a more imperfect, but in a more perfect way. ”

“ Further, among like things there is mutual likeness; for like is like to like. If therefore any creature is like God, God will be like some creature, which is against what is said by Isaias: "To whom have you likened God?" ”