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.

You have to see failure as the beginning and the middle, but never entertain it as the end.

在数学中，你并不理解事物。你只是习惯了它们。

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.

空间必须被感受才能被理解。