Sigmund Freud's immensely influential theory rests squarely on his analysis of human nature. We seek to cope with inner turmoil through sublimation of our instincts, but as he says, our coping mechanisms are inadequate, and unhappiness is much easier to attain than happiness. Freud's conclusions are unquestionably pessimistic and powerfully expressed in his classic text, Civilization and Its Discontents.