2. Except for a sincere friend, no medicine can communicate with the heart. To a sincere friend, you can convey your worries, joys, fears, hopes, suspicions, admonitions and anything that weighs on your heart. -bacon
3. Many people who look like friends are not friends, while many who are friends don't look like friends. -Greece
4. It is the basic principle of human social attribute to enjoy a small group of like-minded friends in a happy society. -edmund burke
5. Make friends in adversity. -Lenin
6. To make friends, you should make friends with people who are loyal, just as a wise doctor must examine the root of the disease before treating a disease, and you must also examine the character of the other person when making friends, otherwise it is dangerous. (Ibn Mujiafa)
7. People who don't even have a good friend are not worth living at all. -democritus