The most profound ideas in mathematics often arise from the simplest observations.

除非我们完全接受自己的现状，否则我们无法改变，无法摆脱现在的自己。

The only thing worth writing about is the human heart in conflict with itself.

We are not in the coffee business serving people, but in the people business serving coffee.

智慧的真正标志不是知识，而是想象力。