所有老年人共享的大秘密是，你在七八十年里真的没有改变。你的身体变了，但你一点也没变。当然，这会引起很大的混乱。
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.
在一切事情中，创造系统是必要的。
现实是心灵的建构。
The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.