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.
我们花了很多时间教领导者该做什么，却没有花足够的时间教他们该停止什么。
"We are all the same, but we are all different."
The difference between a successful person and others is not a lack of strength, not a lack of knowledge, but rather a lack in will.
诗歌的力量在于它的简洁和深度。
