During the Han Dynasty, Dong Zhongshu pointed out that "nourishing the heart relies on justice". Noble morality and integrity can keep one's mood pleasant and maintain mental health. "A person with righteousness, even if poor, can be self-content; whereas a person without righteousness, even if rich, cannot survive." "Therefore, benevolent people tend to live longer because they have no greed from outside and remain calm and peaceful within. Their minds are balanced and impartial, and they take the beauty of nature to nourish their bodies."