A fo may grow gray, but never good.

a fox may grow gray, but never good.

江山易改，本性難移。

a friend in need is a friend indeed.

患難見真情。

a friend is easier lost than found.

得朋友難，失朋友易。

a friend is never known till a man has need.

需要之時方知友。

a friend without faults will never be found.

沒有十全十美的朋友。

'after you' is good manners.

“您先請”是禮貌。

a good beginning is half done.

良好的開端是成功的一半。

a good beginning makes a good ending.

善始者善終。

a good book is a good friend.