我们无法仅依靠理性来认识因果关系。
We cannot know the cause, and therefore the effect, by reason alone.
The truth is, the past is all we have. We can't change it, but we can learn from it.
The most perfect education, in my opinion, is such an exercise of the understanding as is best calculated to strengthen the body and form the heart.
没有内容的思想是空洞的，没有概念的直觉是盲目的。