我们都被过去所困扰，过去总是存在的。

Sustainability isn't an option; it's a responsibility we owe to the next generation.

幽默是一种讲述真相的方式，而不必过于严肃。

The only constant in life is change.

数学是理性的音乐。

"The only thing that is truly powerful is the human spirit."

The worst evils in history have always been committed by those who truly believed they were combating evil. Beware of combating evil.

所有行为最终都可简化为物理和化学过程。