The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.

The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.

Success is the best revenge for anybody doubting you.

在奥林匹克誓言中，我只要求一件事：体育忠诚。