The price of freedom is the willingness to do sudden battle, anywhere, at any time, and with utter recklessness.

Why is it that when one man builds a wall, the next man immediately needs to know what's on the other side?

Time does not heal all wounds, but it teaches us how to live with them.

Sometimes the hardest person to forgive is yourself.

In the exploration of science, we must not only ask why but also why not.

我年纪越大，越发现先做重要的事情这一古老规则的智慧——这个过程通常可以把最复杂的人类问题简化为可以处理的规模。