Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.

"I don't believe in happy endings."

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

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

A mathematician's best work often comes from seeing connections where others see none.

银行的存在是因为它们有助于缓解信息不对称造成的问题。