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.

数学中最深刻的见解往往来自最抽象的理论。

我们观察到的宇宙恰好具有我们所期望的特性，如果从根本上说，没有设计，没有目的，没有邪恶也没有善良，只有盲目的、无情的冷漠。

I never look back, I always look forward.