数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。

To live is not to breathe， but to act.

A government that fears its people is a government that has lost its legitimacy.

我学会了不能控制一切，有时候你只能放手。

Freedom is not merely the opportunity to do as one pleases; neither is it merely the opportunity to choose between set alternatives. Freedom is, first of all, the chance to formulate the available choices, to argue over them - and then, the opportunity to choose.