走路，应缓慢又稳健；站立，应端直又恭敬；坐着，应端庄又平正；说话，应低沉又和缓。

数学是模式的科学，我们研究它们以学习如何逻辑地、批判地和创造性地思考。

理论计算机科学的美在于它能够将抽象的数学概念与实际的计算问题联系起来。

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.