We cannot change the past, but we can change our view of it.
我们不能改变过去,但我们可以改变对过去的看法。
The language of mathematics is the language of the universe, and by learning it, we can understand the cosmos.
并不存在一个自由美国和一个保守美国的区别 - 只有团结的美利坚合众国。
"Books are the keys to understanding ourselves and others."