"I distinguished between the unity there is in virtue and the discord there is in vice. I conceived that the unity consisted of the rational soul and the nature of truth and the highest good. But I imagined that in the disunity there was some kind of substance of irrational life and some kind of entity in the supreme evil. This evil I thought was not only a substance but real life as well, and yet I believe that it did not come from you, my god, from whom are all things. And the first I called a monad, as if it were a soul without sex. The other I called a dyad, which showed itself in deeds of violence, in deeds of passion and lust--but I did not know what I was talking about. For I had not understood nor had I been taught that evil is not a substance at all and that our soul is not that supreme and unchangeable good." [4.25.24]
monad - from "Whatis.com"
2) A kind of
4) A symbol used by ancient Greek philosophers, including Plato, Pythagoras and Aristotle, to describe God or the totality of all beings. Metaphysical and theological theory describes "monism" as the concept of "one essence."dyad - Greek philosopher's principle of "twoness" or "otherness"