Politeness is the first important thing in living habits.

3. A gentleman can't tolerate what others can't tolerate, tolerate what others can't tolerate, and treat what others can't tolerate. -Manan

4, the soil can support the city wall, and it is thick. -Li Bai

There is an innate courtesy, which is related to love. It will produce the most pleasant behavior on the appearance of behavior. -Goethe

6. Thoughtful courtesy is never more sincere than "your humble servant" at the end of the challenge book. Of course, this is generally recognized and understood by people. Chesterfield