一个人只要愿意，就是自由的。
Man is free at the moment he wishes to be.
The farmer is the only man in our economy who has to buy everything at retail, sell everything at wholesale, and pay the freight both ways.
The joy of discovery in mathematics is unparalleled.
You can be whatever you want to be. Just be yourself.
Mathematics is the language of the universe, and through it, we can understand the fundamental principles that govern our world.