[Kamog]

I once read in a book the following argument: Out of the three statements below, only two of them can be true:
(1) God is all powerful
(2) God is all good
(3) Terrible things happen

If God knows that there is evil but cannot prevent it, he is not all-powerful. If he doesn't know that there's evil, he's not omnisicent. If he knows that there is evil but does not wish to prevent it, then he is not all good.

The only possible way that all three can be true, is if God knows there is evil in the world but chooses not to stop it for reasons that are beyond our understanding.