What contempt man brought upon God, when he allowed himself to be conquered by the devil; for which he can make no satisfaction.
Anselm. Man being made holy was placed in paradise, as it were in the place of God, between God and the devil, to conquer the devil by not yielding to his temptation, and so to vindicate the honor of God and put the devil to shame, because that man, though weaker and dwelling upon earth, should not sin though tempted by the devil, while the devil, though stronger and in heaven, sinned without any to tempt him. And when man could have easily effected this, he, without 231compulsion and of his own accord, allowed himself to be brought over to the will of the devil, contrary to the will and honor of God.
Boso. To what would you bring me?
Anselm. Decide for yourself if it be not contrary to the honor of God for man to be reconciled to Him, with this calumnious reproach still heaped upon God; unless man first shall have honored God by overcoming the devil, as he dishonored him in yielding to the devil. Now the victory ought to be of this kind, that, as in strength and immortal vigor, he freely yielded to the devil to sin, and on this account justly incurred the penalty of death; so, in his weakness and mortality, which he had brought upon himself, he should conquer the devil by the pain of death, while wholly avoiding sin. But this cannot be done, so long as from the deadly effect of the first transgression, man is conceived and born in sin.
Boso. Again I say that the thing is impossible, and reason approves what you say.
Anselm. Let me mention one thing more, without which man’s reconciliation cannot be justly effected, and the impossibility is the same.
Boso. You have already presented so many obligations which we ought to fulfil, that nothing which you can add will alarm me more.
Anselm. Yet listen.
Boso. I will.
Source: Cur Deus Homo (CCEL)