Behavior/psychology

Famous quotes containing the words behavior and/or psychology:

“Two things in America are astonishing: the changeableness of most human behavior and the strange stability of certain principles. Men are constantly on the move, but the spirit of humanity seems almost unmoved.”
—Alexis de Tocqueville (1805–1859)

“Idleness is the beginning of all psychology. What? Could it be that psychology is—a vice?”
—Friedrich Nietzsche (1844–1900)