Death is not the opposite of life, but part of it.

Reform requires courage, but even more wisdom.

The human race has one really effective weapon, and that is laughter.

心理学家必须避免一切目的论的解释。

每一次实验，即使失败，也会教会我们一些宝贵的东西。

Understanding the real lives of the poor is the first step toward designing effective policies to help them.

Words are like keys. If you choose the right ones, they can open any door.