Not only that, he also left an eternal famous saying about the principle of treating people with things: "The greater the courage, the smaller the heart, the rounder the wisdom and the more square the heart." He warned his disciples: "The heart is king, and the king is respectful, so I want to be small and not do it." "Poetry" says, "If you are on the abyss, you are walking on thin ice", which means smallness. Courage is will, decision is service, so desire is great. "Poetry" said "a valiant soldier, a duke, a dry city", that is great. Benevolent people are quiet, like the earth, so they want to be sideways. "Biography" said "not for profit, not for sin", which means also. A wise man moves like a sky, so he wants to be round. "Yi" said, "Play it by ear, not all day long", which is also called circle.
When the disciple further asked about the importance of self-cultivation, he replied: "Heaven is full of surplus and shortage, and people are in danger. They can't help themselves if they are not careful. Therefore, we must be cautious in cultivating our self-cultivation. Caution is based on fear, so the fearless scholar is simple and upright, the fearless farmer is discredited, the fearless worker is slow to move, the fearless businessman has no education, the fearless son forgets filial piety, the fearless father is abandoned, the fearless minister is disrespected, and the fearless gentleman is discredited. It is the fear of the Tao, followed by the fear of heaven, the fear of things, the fear of people and the fear of the body. Those who worry about themselves are not confined to others, those who fear themselves are not subject to others, those who are cautious are not afraid of the big, and those who avoid the near are not afraid of the far. Knowing this, you are finished. "