Saint Anselm

“ CHAPTER XV How this death removes even the sins of his murderers.
Boso. This is properly so with regard to all sins not affecting the person of the Deity. But let me ask you one thing more. If it be as great an evil to slay him as his life is a good, how can his death overcome and destroy the sins of those who slew him? Or, if it destroys the sin of any one of them, how can it not also destroy any sin committed by other men? For we believe that many men will be saved, and a vast many will not be saved. ”

“ Therefore have we clearly found that Christ, whom we confess to be both God and man, died for us; and, when this is known beyond all doubt, all things which he says of himself must be acknowledged as true, for God cannot lie, and all he does must be received as wisely done, though we do not understand the reason of it. ”

“ For no man could ever, knowingly at least, slay the Lord; and, therefore, those who did it in ignorance did not rush into that transcendental crime with which none others can be compared. For this crime, the magnitude of which we have been considering as equal to the worth of his life, we have not looked at as having been ignorantly done, but knowingly; a thing which no man ever did or could do.
Boso. You have reasonably shown that the murderers of Christ can obtain pardon for their sin. ”