That Nothing Whatever, Short of God, Can Yield to the Rational Creature a Happy Rest
9 The angels fell, the soul of man fell and they have thus indicated the abyss in that dark deep, ready for the whole spiritual creation, unless You had said from the beginning, “Let there be light,” and there had been light, and every obedient intelligence of Your celestial City had cleaved to You, and rested in Your Spirit, which unchangeably is “borne over” everything changeable. Otherwise, even the heaven of heavens itself would have been a darksome deep, whereas now it is light in the Lord.
For even in that wretched restlessness of the spirits who fell away, and, when unclothed of the garments of Your light, discovered their own darkness, dost Thou sufficiently disclose how noble You have made the rational creature; to which nought which is inferior to You will suffice to yield a happy rest, and so not even herself. For Thou, O our God, shall enlighten our darkness; from You are derived our garments of light, and then shall our darkness be as the noonday. Give Yourself unto me, O my God, restore Yourself unto me; behold, I love You, and if it be too little, let me love You more strongly.
I cannot measure my love, so that I may come to know how much there is yet wanting in me, ere my life run into Your embracements, and not be turned away until it be hidden in the secret place of Your Presence. This only I know, that woe is me except in You—not only without, but even also within myself; and all plenty which is not my God is poverty to me.
Source: Confessions (New Advent)