在经济学中，魔鬼往往藏在细节里。

魔鬼藏在我们选择忽视的细节里。

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

To do mathematics is to explore a universe of ideas, where the only limit is your imagination.

You build your life around what you fear, and then you spend your life being afraid.

语言不仅仅是交流的工具；它是一种看待世界的方式。