There is a fundamental division between philosophers such as Hume, who think that all motivation exists only in a perspective given by desire and aversion, and those such as Plato or Kant who believe that reason is an independent source of motivation. the other perennially fascinating problem is what people ‘really’ want. When people say what they want, or describe the purposes, intentions, emotions or goals they have, are we to believe them? And what are the empirical tests? Radical strategies of interpretation such as psychoanalysis or psychological egoism suppose that we are systematically deceived about our own motivations. But does it make sense to suppose that our own self-interpretations are so generally fallible, or do we have some kind of authority in saying how we are motivated? See also moral motivation.