The Divine Institutes

Now, since we have refuted false religion, which is in the worship of the gods, and false wisdom, which is in the philosophers, let us come to true religion and wisdom. And, indeed, we must speak of them both conjointly, because they are closely connected. For to worship the true God, that and nothing else is wisdom. For that God who is supreme and the Maker of all things, who made man as the image of Himself, on this account conferred on him alone of all animals the gift of reason, that he might pay back honour to Him as his Father and his Lord, and by the exercise of this piety and obedience might gain the reward of immortality. This is a true and divine mystery. But among those, because they are not true, there is no agreement. Neither are sacred rites performed in philosophy, nor is philosophy treated of in sacred things; and on this account their religion is false, because it does not possess wisdom; and on this account their wisdom is false, because it does not possess religion. But where both are joined together, there the truth must necessarily be; so that if it is asked what the truth itself is, it may be rightly said to be either wise religion or religious wisdom.