As follows:

1. True friendship can only be based on the combination of similar temperaments. ——Beethoven

2. As long as you think about how many things in a person's life cannot be done by himself, you can know how beneficial friendship is. ——Bacon

3. True friendship is like health. You cannot appreciate its preciousness until it is lost. ——Bacon (UK)

4. True friendship always anticipates the needs of the other person rather than announcing what one needs. ——Mo Luoya

5. Be a good person first, and then find people who are similar to you to be your friends. Only in this way can friendship grow steadily. ——Cicero

6. True friendship is a slow-growing plant. It must experience and withstand the impact of adversity to be worthy of the title of friendship. ——Washington

7. True friendship is sincere and bold. ——Schiller

8. True friendship can not only tolerate the advice given by friends, but also allow oneself to accept the advice. ——Cicero