Nevertheless, let no one boast. Just as every man, though he be the greatest genius, has very definite limitations in some one sphere of knowledge, and thus attests his common origin with the essentially perverse and stupid mass of mankind, so also has every man something in his nature which is positively evil. Even the best, nay the noblest, character will sometimes surprise us by isolated traits of depravity; as though it were to acknowledge his kinship with the human race, in which villainy--nay, cruelty--is to be found in that degree.