God cannot simply ignore man’s disobedience and all the evil of history; he cannot treat it as if it were inconsequential or meaningless. Such “mercy”, such “unconditional forgiveness” would be that “cheap grace” to which Dietrich Bonhoeffer rightly objected in the face of the appalling evil encountered in his day. That which is wrong, the reality of evil, cannot simply be ignored; it cannot just be left to stand. It must be dealt with; it must be overcome. Only this counts as true mercy.
–Pope Benedict XVI, Jesus of Nazareth, Volume 2.