The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.

发现自己适合做什么，并确保有机会去做，这是幸福的关键。

To be is to do.

过去总是与我们同在，但它不必定义我们。

数学不仅仅是关于数字、方程、计算或算法，而是关于理解。