A man is like a fraction whose numerator is what he is and whose denominator is what he thinks of himself. The larger the denominator, the smaller the fraction.
历史学家的首要职责是忠于真相。
安全困境是国际政治的一个基本特征，因为国家增加自身安全的努力往往会降低其他国家的安全。
The most successful people in life are the ones who ask questions. They’re always learning. They’re always growing. They’re always pushing.
成功的关键是专注于目标，而不是障碍。
要理解宇宙，你必须理解它所用的语言，那就是数学。
People who decry the fact that businesses are in business "just to make money" seldom understand the implications of what they are saying. You make money by doing what other people want, not what you want.