The flesh does not by its own virtue purify, but is purified by virtue of the Word by which it was assumed, when 'the Word became flesh and dwelt among us' (Jn. 1:14).
Saint AugustineThe mind commands the body and is instantly obeyed. The mind commands itself and meets resistance. The mind commands the hand to move, and it so easy that one hardly distinguishes the order from its execution. Yet mind is mind and hand is body. The mind orders the mind to will. The recipient of the order is itself, yet it does not perform it.
Saint AugustineFurthermore, what profit was it to me that I, rascally slave of selfish ambitions that I was, read and understood by myself as many books as I could get concerning the so-called liberal arts?...I had turned my back to the light and my face to the things it illuminated, and so no light played upon my own face, or on the eyes that perceived them.
Saint Augustine