A fo may grow gray, but never good.

师哈哈达人

　　a fox may grow gray, but never good.
　　江山易改，本性难移。
　　a friend in need is a friend indeed.
　　患难见真情。
　　a friend is easier lost than found.
　　得朋友难，失朋友易。
　　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。
　　'after you' is good manners.
　　您先请是礼貌。
　　a good beginning is half done.
　　良好的开端是成功的一半。
　　a good beginning makes a good ending.
　　善始者善终。
　　a good book is a good friend.