"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."
书籍是最安静、最恒久的朋友；它们是最易接近、最睿智的顾问，也是最耐心的老师。
The human being is the only animal that thinks about the future.
我认为一个女人最重要的东西——当然，除了才华之外——是她的发型师。
数学之美只会向更有耐心的追随者展现。
The greatest mistake a man can make is to be afraid of making one.
工具变量的美妙之处在于它们让我们以新的视角看世界。