I’m positive that in 100 years much of what I take to be true today will be proved to be wrong， maybe even embarrassingly wrong， and I try really hard to identify what it is that I am wrong about today.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

Geometry is not just about shapes; it is about understanding the space we live in and the relationships within it.

最好的故事是那些提出问题而不仅仅是提供答案的故事。