No slave system has ever been able to continue to function on the slaves provided by its own biological reproduction because the rate of human reproduction is too slow and the expense from infant mortality and years of unproductive upkeep of the young make this prohibitively expensive. This relationship is one of the basic causes of the American Civil War, and was even more significant in destroying ancient Rome.
Historically 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.
I foresee the time when the painter will paint that scene, no longer going to Rome for a subject; the poet will sing it; the historian record it; and, with the Landing of the Pilgrims and the Declaration of Independence, it will be the ornament of some future national gallery, when at least the present form of slavery shall be no more here. We shall then be at liberty to weep for Captain Brown. Then, and not till then, we will take our revenge.