You can never eat your cake and have it.事难两全其美；The fox may grow gray,but never good.江山易改,本性难移；A little learning is a dangerous thing.浅学误人；Between two stools you fall to the ground.脚踩两条凳,早晚要跌地；Diligence is the mother of good luck.勤为佳运之母；It is never too late to learn.活到老,学到老；One day is worth two tomorrow.把握一个今天,胜过两个明天；Tall trees catch much wind.树大招风；Saying is one thing,doing another.说是一回事,做是另一回事；Time and tide wait for no man.岁月不待人；Think a great deal of oneself.过高的估计自己；A bad workman quarrels with his tools.拙匠常怨工具差；A bird is known by its note,and a man by his talk.闻其歌知其鸟,听其言知其言
