历史学家必须与其研究对象有某种亲缘关系。死者不会开口，除非你以恰当的方式呼唤他们。

理解经济波动的关键在于理解人们如何形成预期。

As a kid， I spent my summers with my grandparents on their ranch in Texas. I helped fix windmills， vaccinate cattle， and do other chores. We also watched soap operas every afternoon， especially "Days of our Lives." My grandparents belonged to a Caravan Club， a group of Airstream trailer owners who travel together around the U.S. and Canada. And every few summers， we'd join the caravan. We'd hitch up the Airstream trailer to my grandfather's car， and off we'd go， in a line with 300 other Airstream adventurers. I loved and worshipped my grandparents and I really looked forward to these trips. On one particular trip， I was about 10 years old. I was rolling around in the big bench seat in the back of the car. My grandfather was driving. And my grandmother had the passenger seat. She smoked throughout these trips， and I hated the smell.

天下的一切事物不可以没有标准，做人要有做人的标准，即原则;做事要有做事的标准，即规则;治国要有治国的标准，即法则。不遵循一定的标准而能成事者，自古以来是没有的。

It is hard to read a newspaper or watch a television newscast without encountering someone who has come up with a new 'solution' to society's 'problems.'

The cognitive map is not a picture or a model in the head, but a dynamic, changing representation of the environment.

最大的回报不是奖牌或纪录，而是旅程本身。