The wild is a place of constant change. To survive, you have to be ready to adapt.
The peculiar evil of silencing the expression of an opinion is that it is robbing the human race； posterity as well as the existing generation； those who dissent from the opinion， still more than those who hold it.
有时候最难的事情和正确的事情是同一件事。
The pursuit of mathematical truth requires both intuition and rigor.
生活是一段旅程，而不是一个目的地。
过去两个世纪最重要的政治发展是现代国家的崛起。
Education does not take root in the soul unless it goes deep.