以下是一些关于友谊的英语谚语：
1. A friend in need is a friend indeed.
2. Friends are like wine; the older, the better.
3. True friendship lasts forever.
4. Friendship is a plant that needs constant watering.
5. Friendship cannot stand always on one side.
6. Friends must part.
7. Friendship is love with understanding.
8. Friends are like books; you don't need many, but you need the good ones.
9. A friend to all is a friend to none.
10. Friends are born, not made.
11. A man is known by the company he keeps.
12. The only way to have a friend is to be a friend.
13. A friend without faults will never be found.
14. Two are better than one; because they have a good return for their labour.
15. No man is a island, entire of itself; every man is a piece of the continent, a part of the main.
这些谚语强调了友谊的重要性、真挚性、持久性和相互性。它们提醒我们，友谊需要不断的维护和投入，同时也告诉我们，真正的友谊是能够经受住时间考验的。
