Everyone feels benevolent if nothing happens to be annoying him at the moment. Thus a man easily comes to console himself for all his other vices by a conviction that “his heart’s in the right place” and “he wouldn’t hurt a fly,” though in fact he has never made the slightest sacrifice for a fellow creature. We think we are kind when we are only happy: it is not so easy, on the same grounds, to imagine oneself temperate, chaste, or humble.
Lewis, C.S. The Problem of Pain (p. 56). Macmillan.
Locusts and Wild Honey 