Aristotle, Nicomachean Ethics
H. Rackham, Ed.

And it seems likely that the man who pursues intellectual activity, and who cultivates his intellect and keeps that in the best condition, is also the man most beloved of the gods. For if, as is generally believed, the gods exercise some superintendence over human affairs, then it will be reasonable to suppose that they take pleasure in that part of man which is best and most akin to themselves, namely the intellect, and that they recompense with their favors those men who esteem and honor this most, because these care for the things dear to themselves, and act rightly and nobly. Now it is clear that all these attributes belong most of all to the wise man. He therefore is most beloved by the gods; and if so, he is naturally most happy. Here is another proof that the wise man is the happiest.