Lactantius

“ For He cannot be produced from any one, who Himself produced all things. I have, as I think, sufficiently taught by arguments, and confirmed by witnesses, that which is sufficiently plain by itself, that there is one only King of the universe, one Father, one God. ”

“ But these are neither gods, nor do they wish to be called gods or to be worshipped, inasmuch as they do nothing but execute the command and will of God. Nor, however, are they gods who are worshipped in common, whose number is small and fixed. But if the worshippers of the gods think that they worship those beings whom we call the ministers of the Supreme God, there is no reason why they should envy us who say that there is one God, and deny that there are many. If a multitude of gods delights them, we do not speak of twelve, or three hundred and sixty-five as Orpheus did ”

“ When the earnest attention of the human mind and its acute sagacity and memory has reached Him, all ways being, as it were, summed up and exhausted, [2] it stops, it is at a loss, it fails; nor is there anything beyond to which it can proceed. ”