13 Or, if you refuse to believe this on account of its novelty, how can you know whether there is not some one, who comes in place of all whom you invoke, and substituting himself in all parts of the world, shows to you what appear to be many gods and powers? Who is that one? Some one will ask. We may perhaps, being instructed by truthful authors, be able to say; but, lest you should be unwilling to believe us, let my opponent ask the Egyptians, Persians, Indians, Chaldeans, Armenians, and all the others who have seen and become acquainted with these things in the more recondite arts. Then, indeed, you will learn who is the one God, or who the very many under Him are, who pretend to be gods, and make sport of men's ignorance.
Even now we are ashamed to come to the point at which not only boys, young and pert, but grave men also, cannot restrain their laughter, and men who have been hardened into a strict and stern humour. For while we have all heard it inculcated and taught by our teachers, that in declining the names of the gods there was no plural number, because the gods were individuals, and the ownership of each name could not be common to a great many; you in fogetfulness, and putting away the memory of your early lessons, both give to several gods the same names, and, although you are elsewhere more moderate as to their number, have multiplied them, again, by community of names; which subject, indeed, men of keen discernment and acute intellect have before now treated both in Latin and Greek. And that might have lessened our labour, if it were not that at the same time we see that some know nothing of these books; and, also, that the discussion which we have begun, compels us to bring forward something on these subjects, although it has been already laid hold of, and related by those writers.
Source: Against the Heathen (New Advent)