When the Kingdom is delivered up to God, even the Father, and all his powers are put down, then perfection begins. Here is hindrance, here weakness even of the perfect; there full protection . . . We then must strive for those things wherein is perfection and wherein is the reality. Here is the shadow, here the symbol; there the reality. Here we walk in the symbol, we see in the symbol; there face to face, where there is full perfection; for all perfection is in the reality.
St. Ambrose: De Officiis.