A life without a friend is a life without a sun.
人生在世无朋友，犹如生活无太阳。

Be slow in choosing a friend; slower in changing.
选择朋友要审慎，摒弃更要审又慎。

A friend in need is a friend indeed.
患难见真交。

A father is a treasure, a brother is a comfort, but a friend is both.
父亲是财富，兄弟是安慰，朋友兼而有之。

A friend exaggerates a man's virtue, an enemy his crimes.
朋友宣扬人的美德，敌人夸大人的罪过。

A friend that you buy with presents will be bought from you.
用礼物“买来”的朋友终会被买走。

Friendship is the golden thread that ties the hearts of all the world.
友谊是一根金线，把全世界的心连在一起。

Without confidence there is no friendship.
没有信任，就没有友谊。

In prosperity our friends know us; in adversity we know our friends.
在顺境中，朋友结识了我们；在逆境中，我们了解了朋友。

Friendship is like money, easier made than kept.
友谊如金钱一般，容易得到却不易保持。

Friendship often ends in love, but love, in friendship—never
友谊常以爱情而结束；而爱情从不能以友谊而告终。——C.C.Colton