经验只是我们给错误起的名字。
People are always blaming their circumstances for what they are. I don't believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and, if they can't find them, make them.
勇气不是没有恐惧,而是战胜恐惧。
相关系数的可能误差不是可以从第一原理推导出来的东西,而是必须通过经验找到的。