"The crucifixion itself is the best, as well as the worst, of all historical events, but the role of Judas remains simply evil. We may apply this first to the problem of other people’s suffering. A merciful man aims at his neighbour’s good and so does “God’s will,” consciously co-operating with “the simple good.” A cruel man oppresses his neighbour, and so does simple evil. But in doing such evil, he is used by God, without his own knowledge or consent, to produce the complex good--so that the first man serves God as a son, and the second as a tool. For you will certainly carry out God’s purpose, however you act, but it makes a difference to you whether you serve like Judas or like John" (C. S. Lewis, The Problem of Pain, p. 111).