Since it is fitting for that man to be God, and also the restorer of sinners, we doubt not that he is wholly without sin; yet will this avail nothing, unless he be taken without sin and yet of a sinful substance. But if we cannot comprehend in what manner the wisdom of God effects this, we should be surprised, but with reverence should allow of a thing of so great magnitude to remain hidden from us. For the restoring of human nature by God is more wonderful than its creation; for either was equally easy for God; but before man was made he had not sinned so that he ought not to be denied existence. But after man was made he deserved, by his sin, to lose his existence together with its design; though he never has wholly lost this, viz., that he should be one capable of being punished, or of receiving God’s compassion. For neither of these things could take effect if he were annihilated. Therefore God’s restoring man is more wonderful than his creating man, inasmuch as it is done for the sinner contrary to his deserts; while the act of creation was not for the sinner, and was not in opposition to man’s deserts. How great a thing it is, also, for God and man to unite in one person, that, while the perfection of each nature is preserved, the same being may be both God and man! Who, then, will dare to think that the human mind can discover how wisely, how wonderfully, so incomprehensible a work has been accomplished?
–Anselm of Canterbury (1033-1109), Chapter XVI of Cur Deus Homo? (Why God Became Man?)