1、A gentleman acts on behalf of an understanding friend, as a woman makes herself beautiful for her lover.
士為知己者用，女為悅己者容。
2、A brother may not be a friend, but a friend will always be a brother.
兄弟不一定是朋友, 而朋友一定是兄弟。
3、Friendship is almost always the union of a part of one mind with a part of another; people are friends in spots.
友誼是兩者思想的結合, 志趣相投才能成為朋友。
4、Be true to your word, your work, and your friend.
人應遵守諾言，忠實自己的工作和友人。
5、I know not whether our names will be immortal; I am sure our friendship will.
我不知道我們的名字能否永垂不朽；我敢說我們的友誼會與世長存。
6、The true friendship seeks to give, not take; to help, not to be helped; to minister, not to be ministered unto.
真正的友誼追求的是給予，而不是索取； 是幫助別人，而不是被人幫助；是為人服務，而不是被人服務。
7、To prepare a friend, three things are required: to honor him present, praise him absent, and assist him in his necessities.
維護朋友，有三件事情要做到：當面要尊重他，不在場時要表揚他， 苦難時要幫助他。
8、Choose thy friends like thy books, few but choice.
選擇朋友要像選書那樣， 數量要少，但質量要精。
9、My friend is not perfect—nor am I—and so we suit each other admirably.
朋友不會十全十美，你自己也一樣，雙方要互相尊敬。
10、For a congenial friend a thousand toasts are too few; in a disagreeable conversation one word more is too many.
酒逢知己千杯少，話不投機半句多。
參考資料：
中國日報-文化
1、A gentleman acts on behalf of an understanding friend, as a woman makes herself beautiful for her lover.
士為知己者用，女為悅己者容。
2、A brother may not be a friend, but a friend will always be a brother.
兄弟不一定是朋友, 而朋友一定是兄弟。
3、Friendship is almost always the union of a part of one mind with a part of another; people are friends in spots.
友誼是兩者思想的結合, 志趣相投才能成為朋友。
4、Be true to your word, your work, and your friend.
人應遵守諾言，忠實自己的工作和友人。
5、I know not whether our names will be immortal; I am sure our friendship will.
我不知道我們的名字能否永垂不朽；我敢說我們的友誼會與世長存。
6、The true friendship seeks to give, not take; to help, not to be helped; to minister, not to be ministered unto.
真正的友誼追求的是給予，而不是索取； 是幫助別人，而不是被人幫助；是為人服務，而不是被人服務。
7、To prepare a friend, three things are required: to honor him present, praise him absent, and assist him in his necessities.
維護朋友，有三件事情要做到：當面要尊重他，不在場時要表揚他， 苦難時要幫助他。
8、Choose thy friends like thy books, few but choice.
選擇朋友要像選書那樣， 數量要少，但質量要精。
9、My friend is not perfect—nor am I—and so we suit each other admirably.
朋友不會十全十美，你自己也一樣，雙方要互相尊敬。
10、For a congenial friend a thousand toasts are too few; in a disagreeable conversation one word more is too many.
酒逢知己千杯少，話不投機半句多。
參考資料：
中國日報-文化