"It was necessary Christ should be both God and man to work our redemption. As He was God, He was able; as He was man, He had aptness. No man nor angel could have effected it. Not man; for how could he, who was dead in sin, give life to others? Not the angels; for they had not sufficiency to stand upright themselves." --Fulgentius, quoted in H. Bonar's Words Old and New.