Didascalicon, Book II: the sciences, their parts and their discipline
Chapter III. On theology
“The intellectible is that which, one and the same in itself, always abiding in its own divinity, is never grasped by any senses but by the mind and understanding alone.” This subject, he says, is composed for the contemplation of God and for the consideration of the incorporeality of the soul, by the inquiry of true philosophy, which the Greeks call theology. “Theology” is so called as being discourse held about divine things; for theos is interpreted God, logos speech or reason. Theology, then, is when we discourse either of the ineffable nature of God or of particular creatures in some part of their most profound quality.