The hypothesis of this article is that Anselm describes two consequences of sin for the human will in De casu diaboli, and these two consequences structure Anselm's later account of human salvation in the Cur Deus homo. First, sin causes us to deserve punishment for injustice; and, second, sin removes the grace by which humans were able to attain the goal of their creation, which is the happiness of heaven. Book 1 of the Cur Deus homo, then, deals with the need for satisfaction in the face of punishment, while book 2 addresses the need for a supererogatory gift that elevates human nature and restores it to its heavenly end. The article argues that, for Anselm, only a God-man can provide both the satisfaction and supererogatory gift necessary to restore humans to their original divine purpose.
