Mathematics is not a spectator sport; to understand it, one must engage with it actively.

We have three baskets for investing：yes，no，and too tough to understand.

To write is to rewrite, and to rewrite is to understand.

The most important single aspect of software development is to be clear about what you are trying to build.

Liberty consists in doing what one desires.

我们需要关注政策的实际结果，而不仅仅是其预期效果。