好奇心推动数学家前进，总是在寻找下一个要回答的问题。
Curiosity drives the mathematician forward, always seeking the next question to answer.
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
不要烦恼啊不要烦恼，连明月的圆缺都难以长久保持。