"The possibility of pain is inherent in the very existence of a world where souls can meet. When souls become wicked they will certainly use this possibility to hurt one another; and this, perhaps, accounts for four-fifths of the suffering of men. It is men, not God, who have produced racks, whips, prisons, slavery, guns, bayonets, and bombs; it is by human avarice or human stupidity, not by the churlishness of nature, that we have poverty and overwork. But there remains, none the less, much suffering which cannot thus be traced to ourselves. Even if all suffering were man-made, we should like to know the reason for the enormous permission to torture their fellows which God gives to the worst of men. To say....that good, for such creatures as we now are, means primarily corrective or remedial good, is an incomplete answer. Not all medicine tastes nasty: or if it did, that is itself one of the unpleasant facts for which we should like to know the reason"
--The Problem of Pain