Of the Origin of the World, and the Nature of Affairs, and the Providence of God
But if this is true, it follows that we are derided by the wise men of old. But if they invented religion for the sake of deceiving us, and moreover of deceiving the whole human race, therefore they were not wise, because falsehood is not consistent with the character of the wise man. But grant that they were wise; what great success in falsehood was it, that they were able to deceive not only the unlearned, but Plato also, and Socrates, and so easily to delude Pythagoras, Zeno, and Aristotle, the chiefs of the greatest sects?
There is therefore a divine providence, as those men whom I have named perceived, by the energy and power of which all things which we see were both made and are governed. For so vast a system of things such arrangement and such regularity in preserving the settled orders and times, could neither at first have arisen without a provident artificer, or have existed so many ages without a powerful inhabitant, or have been perpetually governed without a skilful and intelligent ruler; and reason itself declares this.
For whatever exists which has reason, must have arisen from reason. Now reason is the part of an intelligent and wise nature; but a wise and intelligent nature can be nothing else than God. Now the world, since it has reason, by which it is both governed and kept together, was therefore made by God. But if God is the maker and ruler of the world, then religion is rightly and truly established; for honour and worship are due to the author and common parent of all things.
Source: On the Anger of God (New Advent)