数学是给不同事物起相同名字的艺术。
Laugh, and the world laughs with you; weep, and you weep alone.
The more we understand individual things, the more we understand God.
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
"Every child is a different kind of flower, and all together make this world a beautiful garden."