What kind of people are missionaries?

According to my current life experience, people who like to preach the truth can be roughly divided into these categories. One is their relatives, who are relatively successful and like to pass on their social experience to the younger generation.

And the dean of our school. Every time I commit a crime, I enter the academic affairs office, and when I come out, I begin to doubt my life and all my previous words and deeds.

In fact, to put it bluntly, one person who likes to preach the truth is very successful and the other wants to succeed. They have always thought that they love to brag to others and have no action.