《礼记·中庸》
因此，君子不能不修德养性想要修德养性，不能不侍奉亲人，想要侍奉亲人，不能不知贤善用，想要知贤善用，不能不知道天理。
故君子不可以不修身；思修身，不可以不事亲；思事亲，不可以不知人，思知人，不可以不知天。
Therefore, a gentleman cannot but cultivate his moral character. If he wants to cultivate his moral character, he cannot but serve his relatives. If he wants to serve his relatives, he cannot but not use the virtuous. If he wants to know the virtuous, he cannot but understand the principles of heaven.