Thus St. Paul speaks of “the mystery of iniquity”—what in our more prosaic and insensible times we tend to call “the problem of evil.” In Paul’s view, to call iniquity a “problem” is to trivialize it beyond recognition. For one who believes not only in God but in the goodness and graciousness of God, iniquity is the profoundest of mysteries. One scarcely dares to speak of it at all, and nothing is more desperately to be avoided, on this subject, than glibness.
~ Alan Jacobs / The Point Magazine