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.
不登上高山，就不知道天是多么高远；不亲临深溪，就不知道地是多么深厚。
There was another life that I might have had, but I am having this one.
革命者的首要职责是受教育。