A friend is easier lost than found.

得朋友难，失朋友易。

A joke never gains an enemy but loses a friend.

戏谑不能化敌为友，只能使人失去朋友。

Between friends all is common.

朋友之间不分彼此。

The friendship of a gentleman is insipid as water.

君子之交淡如水。

A faithful friend is the medicine of life.

真诚的朋友如一剂生活的良药。

What is a friend? A single soul dewlling in two bodies.

朋友是什么？两幅躯壳拥有同一个灵魂。

A friend is never known till a man has need.

需要之时方知友。

No man is the whole of himself; his friends are the rest of him.

任何人自己都不是完整的；他的朋友是他的其余部分。