The best way to design a program is to design it.

写作需要一颗心。没有激情，我什么都不是。

The most important thing in mathematics is to understand the concepts, not just to memorize formulas.

Every life is in many days, day after day. We walk through ourselves, meeting robbers, ghosts, giants, old men, young men, wives, widows, brothers-in-love, but always meeting ourselves.

The goal of economics is to understand how to allocate scarce resources in the most efficient way possible.

简约是终极的复杂。