A friend is never known till a man has need 需要之時方知友。

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。

A life without a friend is a life without a sun 人生在世無朋友，猶如生活無太陽。

Be slow in choosing a friend; slower in changing 選擇朋友要審慎，摒棄更要審又慎。

A friend in need is a friend indeed 患難見真交。

Betraying a trust is a very quick and painful way to terminate a friendship.---Ralph Waldo Emerson, American thinker 背信棄義會迅速而痛苦地斷送友誼。---美國思想家 愛默生

Both together do best of all. 二人同心，無往不勝。

Do not speak of your happiness to one less fortunate than yourself. 不要向不如你幸福的人說你自己的幸福。 ——Plutarch

Don’t ask others to also do not allow others to do the dirty things, as a principle of friendship既不請求別人也不答應別人去做卑鄙的事情，為友誼的一項原則。 --（古羅馬）西塞羅 ?

Short reckonings make long friends.好借好還再借不難。怎么外國人的朋友的名言都是借來借去...

With friends like that, who needs enemies?說的是如果有這種人做朋友，還用得著敵人嗎?說這朋友很不夠義氣。

A friend is easier lost than found.得朋友難，失朋友易。