荒野不在乎你的借口。它只在乎你的行动。

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。

The best way to learn about poverty is to go out and talk to the poor themselves.

History teaches us that in 100 years from now some of the assumptions you believed will turn out to be wrong. A good question to ask yourself today is “What might I be wrong about？”