经济理论提供工具，但现实世界的测试会完善它们。
Economic theory provides the tools, but real-world testing refines them.
写作是保存记忆的一种方式。
幸福的关键是有梦想。成功的关键是实现你的梦想。
The main task in life is to give birth to ourselves, to become what we potentially are.
There can be no permanent progress in the battle against hunger until the agencies that fight for increased food production and those that fight for population control unite in a common effort.
相信自己能做到，你已经成功了一半。