Simple Evil and Complex 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.

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The Problem of Pain (New York: Macmillian Publishing Co., Inc., 1962), 111.