创造财富的根本在于生产力的不断提高。

"La libertad no es un regalo, es una conquista diaria."

The thing about happiness is that you only know you had it when it's gone.

Every day confirms his belief of the inconsistency of all human characters, and of the little dependence that can be placed on the appearance of merit or sense.

沉默可以是同意的一种形式，但也可能是反抗的一种方式。

相对论不仅仅是一种科学理论，而且是一种哲学理论，它深刻地影响了我们对宇宙的概念。

"A writer's duty is to tell the truth, even when it is uncomfortable."

世界需要能源，但它比以往任何时候都更需要负责任的能源。