我们可以轻易地原谅一个孩子怕黑；但成人怕光是人生的真正悲哀。
We can easily forgive a child who is afraid of the dark；the real tragedy of life is when men are afraid of the light.
I'm not a person who gives up on my light.
The most important challenge facing the world today is the need to create strong, effective, and accountable states in the developing world.
The most valuable resource in agriculture isn't land or water—it's knowledge.