From Sam Harris: Many people seem to believe that morality depends for its existence on a metaphysical quantity called “free will.” This conviction is occasionally expressed — often with great impatience, smugness, or piety — with the words, “ought implies can.” Like much else in philosophy that is too easily remembered (e.g. “you can’t get an ought from an is.”), this phrase has become an impediment to clear thinking. In fact, the concept of free will is a non-starter, both philosophically and scientifically. There is simply no description of mental and physical causation that allows for this freedom that we habitually claim for ourselves and ascribe to others. Understanding this would alter our view of morality in some respects, but it wouldn’t destroy the distinction between right and wrong, or good and evil.