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.

自守表示的研究是数学抽象之美的反映。

We perceive the world in terms of its utility for our survival.

被世人称为不道德的书，其实是揭示了世界自身的羞耻。