The most exciting breakthroughs of the 21st century will not occur because of technology but because of an expanding concept of what it means to be human.

To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.

In mathematics, the art of proposing a question must be held of higher value than solving it.

生命太短暂，它无法承受无休止的恩恩怨怨。

Quality is more important than quantity.One home run is much better than two doubles.