5 Since, then, you have recalled to our remembrance by your letter these and other things which I think it better to pass over meanwhile, why may not we make sport of your gods, which, as every one who knows your mind, and has read your letters, is well aware, are made sport of abundantly by yourself? Therefore, if you wish us to discuss these subjects in a way becoming your years and wisdom, and, in fact, as may be justly required of us, in connection with our purpose, by our dearest friends, seek some topic worthy of being debated between us; and be careful to say on behalf of your gods such things as may prevent us from supposing that you are intentionally betraying your own cause, when we find you rather bringing to our remembrance things which may be said against them than alleging anything in their defence. In conclusion, however, lest this should be unknown to you, and you might thus be brought unwittingly into jestings which are profane, let me assure you that by the Christian Catholics (by whom a church has been set up in your own town also) no deceased person is worshipped, and that nothing, in short, which has been made and fashioned by God is worshipped as a divine power. This worship is rendered by them only to God Himself, who framed and fashioned all things.
These things shall be more fully treated of, with the help of the one true God, whenever I learn that you are disposed to discuss them seriously.
Source: Letters (New Advent)