切东西的时候不要冲着自己。

Every problem in mathematics is an opportunity to learn something new.

我们最终拥有的唯一工具就是我们的智慧。

In truth, the foundation of education in general is the education of the poor.

On innovation: "I think frugality drives innovation， just like other constraints do. One of the only ways to get out of a tight box is to invent your way out."

心理活动是有机体与其环境的对话。