好的计量经济学就像好的木工——关键在于为工作使用正确的工具。

在科学界，荣誉归于说服世界的人，而不是第一个想到这个想法的人。

"Every film is a documentary of its own making."

The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.