What do you mean, the heart is only in danger, and the heart is only tiny?

Zhu's explanation in Preface to the Doctrine of the Mean is as follows: (People's hearts are only in danger, while Tao's heart is only light). However, those who think that the human heart is different from the Taoist heart are either out of the private nature of body and qi or out of the meaning of life, so they are different because of danger, or uneasy or subtle. But people are tangible, so although they are wise, they can't be ruthless, and they all have sex, so they are stupid and can't be ruthless. The two are mixed in the square inch, and I don't know how to treat them. The more dangerous a person is, the less he is, and the just public pawn can't overcome his wife's selfish desires. (only the essence is exclusive). The essence is to examine the relationship between husband and wife, and the other is to keep one's inner integrity and never give up. If you engage in business, you will always be the master of Tao. Every time people listen to you, they are safe, weak, moving and static clouds, which are the differences between themselves and themselves.