The experience of the past lives little doubt that every economic system must sooner or later rely upon some form of the profit motive to stir individuals and groups to productivity. Substitutes like slavery, police supervision, or ideological enthusiasm prove too unproductive, too expensive, or too transient.
Will DurantSo I should say that civilizations begin with religion and stoicism: they end with scepticism and unbelief, and the undisciplined pursuit of individual pleasure. A civilization is born stoic and dies epicurean.
Will DurantHistorically the belief in heaven and the belief in utopia are like compensatory buckets in a well: when one goes down the other comes up. When the classic religions decayed, communistic agitation rose in Athens (430 B.C.), and revolution began in Rome (133 B.C.); when these movements failed, resurrection faiths succeeded, culminating in Christianity; when, in our eighteenth century, Christian belief weakened, communism reappeared. In this perspective the future of religion is secure.
Will Durant