逻辑学研究不仅仅是关于形式系统，更是关于理性思维和话语的规范。

I’d tell men and women in their mid-twenties not to settle for a job or a profession or even a career. Seek a calling. Even if you don’t know what that means, seek it. If you’re following your calling, the fatigue will be easier to bear, the disappointments will be fuel, the highs will be like nothing you’ve ever felt.

We don't inherit the earth from our ancestors; we borrow it from our children.

Writing is a way of talking without being interrupted.

Quality is not a fad; it is a philosophy.

The art of teaching consists in large part of the ability to awaken the natural curiosity of young minds and to satisfy it with the nourishment of knowledge.