The first half of the sentence says don't hurt people's hearts, while the second half means asking others to set an example. In the final analysis, this is based on distrust between people. Fundamentally speaking, the awareness of social integrity is not enough. What we lack in dealing with interpersonal relationships is a kind of credit. It should be said that this is a last resort. However, many of us regard this sentence as a wise saying and teach the next generation in many ways. This may be the sorrow of our society.