HOPE

[A]lmighty God. . ., because he is supremely good, would never allow any evil whatsoever to exist in his works if he were not so all-powerful and good as to cause good to emerge from evil itself.

In time we can discover that God in his almighty providence can bring a good from the consequences of an evil, even a moral evil, caused by his creatures: “It was not you,” said Joseph to his brothers, “who sent me here, but God. . . . You meant evil against me; but God meant it for good, to bring it about that many people should be kept alive.” (Gen 45:8; 50:20; cf. Tob 2:12-18 [Vulg]) From the greatest moral evil ever committed—the rejection and murder of God’s only Son, caused by the sins of all men—God, by his grace that “abounded all the more” (Cf. Rom 5:20), brought the greatest of goods: the glorification of Christ and our redemption. But for all that, evil never becomes a good.

Faith gives us the certainty that God would not permit an evil if he did not cause a good to come from that very evil, by ways that we shall fully know only in eternal life.

The power of Satan is, nonetheless, not infinite. He is only a creature, powerful from the fact that he is pure spirit, but still a creature. He cannot prevent the building up of God's reign. Although Satan may act in the world out of hatred for God and his kingdom in Christ Jesus, and although his action may cause grave injuries—of a spiritual nature and, indirectly, even of a physical nature—to each man and to society, the action is permitted by divine providence which with strength and gentleness guides human and cosmic history. It is a great mystery that providence should permit diabolical activity, but "we know that in everything God works for good with those who love him." (Rom 8:28)

But why did God not prevent the first man from sinning? St. Leo the Great responds, "Christ's inexpressible grace gave us blessings better than those the demon's envy had taken away." (St. Leo the Great, Sermo 73, 4: PL 54, 396) And St. Thomas Aquinas wrote, "There is nothing to prevent human nature's being raised up to something greater, even after sin; God permits evil in order to draw forth some greater good. Thus St. Paul says, ‘Where sin increased, grace abounded all the more'; and the Exultet sings, ‘O happy fault, . . . which gained for us so great a Redeemer!.' (St. Thomas Aquinas, STh III, 1, 3, ad 3; cf. Rom 5:20)

The victory that Christ won over sin has given us greater blessings than those which sin had taken from us: "where sin increased, grace abounded all the more." (Rom 5:20)

CCC: 311, 312, 324, 395, 412, 420