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 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. 没有十全十美的朋友。 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. 好书如挚友。 A good conscience is a soft pillow. 不做亏心事，不怕鬼叫门。 A good medicine tastes bitter. 良药苦口。