Every pain is an indistinct signal that something is wrong, which may engender either a good or bad result depending on the sagacity and strength of mind of the sufferer. Anxiety may precipitate panic, or an accurate analysis of what is amiss. A sense of injustice may lead to murder, or to a ground-breaking work of economic theory. Envy may lead to bitterness, or to a decision to compete with a rival and the production of a masterpiece. As Nietzsche’s beloved Montaigne had
