Human Nature

"Each of us has his weaknesses. Human nature is incomprehensible. One cannot even say with certainty whether a man is good or evil, stupid or intelligent. There does not exist a good man who has not at some time in his life committed a cruel act, nor an evil man who has not done good, nor an intelligent man who has never been foolish, nor a fool who has never acted intelligently! Still, that's what gives life its diversity, its surprises. I find the idea rather amusing." Irène Némirovsky, The Courilof Affair.