The belief in a supernatural source of evil is not necessary; men alone are quite capable of every wickedness. – Joseph Conrad, Under Western Eyes, 1911

Man is the only kind of varmint sets his own trap, baits it, then steps in it. – John Steinbeck, Sweet Thursday

It is curious to note the old sea-margins of human thought! Each subsiding century reveals some new mystery; we build where monsters used to hide themselves. – Henry Wadsworth Longfellow, Kavanagh, 1849