A good mathematician is always ready to generalize.
Success isn't owned, it's leased, and rent is due every day.
The only way to get through life is to laugh your way through it. You either have to laugh or cry. I prefer to laugh. Crying gives me a headache.
在数学中,你并不理解事物。你只是习惯了它们。
Happiness and unhappiness depend upon the opinion we have of things.