学习速度是当今世界唯一可持续的竞争优势。

False happiness renders men stern and proud， and that happiness is never communicated. True happiness renders them kind and sensible， and that happiness is always shared.

The concept of law is a complex one, involving not only rules but also principles, policies, and standards.

我现在确信理论物理学实际上是哲学。

每一本书都是作者与读者之间的一场对话。

Do not be afraid to fail. Be afraid not to try.