God’s speech from his throne in Book 3 lays out the most difficult problem in Christian theology, the conflict between human free will and the doctrine, stated by Paul in Romans 8-9, that God predestines every human being either to salvation or damnation before we are even born. The Father pronounces humanity guilt, “Sufficient to have stood, though free to fall,” but how can that be reconciled with the idea that we are saved only by God’s grace, which he withholds from some for reasons no one knows? Milton’s daring liberalization of predestination, in which everyone is given sufficient grace, even if some are given extra. Also, the problem of how Satan, Adam, and Eve ever chose evil if he created them perfect. And finally, the issue of why atonement is necessary if God is love—why does God demand a human sacrifice?