actions speak louder than words.
事实胜于雄辩。
adversity leads to prosperity.
穷则思变。
adversity makes a man wise, not rich.
逆境出人才。
a fair death honors the whole life.
死得其所，流芳百世。
a faithful friend is hard to find.
知音难觅。
a fall into a pit, a gain in your wit.
吃一堑，长一智。
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.