People are always blaming their circumstances for what they are. I don't believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and, if they can't find them, make them.

数学不是一项观赏性运动。你必须亲自去做才能理解它。

成功不是幸福的关键。幸福是成功的关键。如果你热爱你所做的事，你就会成功。