I believe it's important to have a passion for what you do. If you don't have a passion, you won't have the energy to keep going when things get tough.

The process of mathematical discovery is as important as the discovery itself.

I'm not lucky, I'm blessed.

The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.

世界不会记住你说的话，但它永远不会忘记你做的事。