政策规则优于自由裁量，因为它们消除了时间不一致性问题。

You get what you give. What you put into things is what you get out of them.

"The only thing worse than being blind is having sight but no vision."

幸福就像一只蝴蝶，当你追逐它时，总是抓不到，但如果你安静地坐下来，它可能会落在你身上。

The only constant in life is change.