Enarrationes in psalmos 66,4.
Quote 09 7
We wear His face: in like manner as the faces of emperors are spoken of, truly a kind of sacred face is that of God in His own image: but unrighteous men know not in themselves the image of God. In order that the countenance of God may be lightened upon them, they ought to say what? “Thou shalt light my candle, O Lord my God, Thou shalt light my darkness.