81:6.7

During primitive times life on Urantia was a serious and sober business. And it was to escape this incessant struggle and interminable toil that mankind constantly tended to drift toward the salubrious climate of the tropics. While these warmer zones of habitation afforded some remission from the intense struggle for existence, the races and tribes who thus sought ease seldom utilized their unearned leisure for the advancement of civilization. Social progress has invariably come from the thoughts and plans of those races that have, by their intelligent toil, learned how to wrest a living from the land with lessened effort and shortened days of labor and thus have been able to enjoy a well-earned and profitable margin of leisure.