"I answer that, It was necessary for man's salvation that there should be a knowledge revealed by God besides philosophical science built up by human… - Thomas Aquinas

Being taken simply, as including all perfection of being, surpasses life and all that follows it; for thus being itself includes all these. And in this sense Dionysius speaks. But if we consider being itself as participated in this or that thing, which does not possess the whole perfection of being, but has imperfect being, such as the being of any creature; then it is evident that being itself together with an additional perfection is more excellent. Hence in the same passage Dionysius says that things that live are better than things that exist, and intelligent better than living things. Reply Obj. 3: Since the end corresponds to the beginning; this argument proves that the last end is the first beginning of being, in Whom every perfection of being is: Whose likeness, according to their proportion, some desire as to being only, some as to living being, some as to being which is living, intelligent and happy. And this belongs to few.

Three things are necessary for man to be saved: knowledge of what is to be believed, knowledge of what is to be desired, and knowledge of what is to be done.

nothing can be known, save what is true;