The Problem of Evil
The individual who wishes to have an answer to the problem of evil has need, first and foremost, of self-knowledge—that is, in the utmost possible knowledge of [their] own wholeness. [They] must know relentlessly how much good [they] can do, and what crimes [they are] capable of, and must beware of regarding the one as real and the other as illusion. Both are elements within [their] nature, and both are bound to come to light in [them], should [they] wish—as [they] ought—to live without self-deception or self-delusion.
—Carl Jung, adapted