"Remember, even those who live justly do so not through human merits but through divine helps. No persons live justly unless they have been made just; and humans are made just by him who can never be unjust. As a lamp is not lighted by itself, so the human soul does not give light to itself but calls out to God: 'You indeed, O Lord, give light to my lamp.'"
-- Commentary on Psalm 110, 2
Prayer. You will light my lamp, Lord my God. I stand in the darkness of my sins, but my shadows will be dispelled by the beam of your wisdom and your face will shine upon me.
-- Commentary on Psalm 66, 4