Experience is a hard teacher because she gives the test first, the lesson afterwards.
What gets us into trouble is not what we don't know.It's what we know for sure that just ain't so.
好朋友就像四叶草一样,要找到很艰难,如果得到却很幸运。
Don't go around saying the world owes you a living. The world owes you nothing. It was here first.