It means that when encountering things, you can use your own heart to measure other people's hearts, and be able to put yourself in others' shoes.

Chinese people have been very humane since ancient times, and they advocate that people should be compassionate when doing things. There is a famous saying in the Confucian Analects: "Don't do to others what you don't want others to do to you." This means that if you don't want to be treated in this way, you should not treat others in that way. What this sentence actually emphasizes is comparing one's heart to one's heart. Comparing one's heart to one's own is the greatest kindness and the best cultivation of a person.

If a person can empathize with others, he will be able to better understand the hardships and difficulties of life, and he will be able to respect others and be kind to others.