 In rationalizing the moral content of legacies of the past like the three-year mourning period after the death of a parent, Confucius reasoned that for three years a filially pious child should not alter a parent’s way (4.20, cf. 19.18), and explains the origin of length of the three-year mourning period to be the length of time that the parents had given their infant child support (17.21). This adaptation of filial piety to connote the proper way for a gentleman to behave both inside and outside the home was a generalization of a pattern of behavior that had once been specific to the family.