A friend is easier lost than found

得朋友难，失朋友易。

A friend in need is a friend indeed.

患难见真情。

A friend is never known till a man has need.

需要之时方知友。

A friend without faults will never be found.

没有十全十美的朋友。

Between friends all is common.

朋友之间不分彼此。

He is a good friend that speaks well of us behind our backs.

背后说好话，才是真朋友。

Life without a friend is death.

没有朋友，虽生犹死。

Misfortune tests the sincerity of friends.

患难见真情。

Old friends and old wines are best.

陈酒味醇，老友情深。