Even the strongest must sleep at times and, when asleep, loses temporarily his superiority. This fact of approximate equality, more than any other, makes obvious the necessity for a system of mutual forbearance and compromise which is the base of both legal and moral obligation. Social life with its rules requiring such forbearance is irksome at times; but it is at any rate less nasty, less brutish, and less short than unrestrained aggression for beings thus approximately equal.