Just the discipline of having to put your thoughts in order with somebody else is very useful thing.

Uncertainty is not an excuse for inaction.

写作是一种不被中断的谈话方式。

The beauty of mathematics only shows itself to more patient followers.

Innovation is not imagination out of thin air, but based on a deep understanding of user needs.

You are never too old to set another goal or to dream a new dream.

智慧胜于邪恶。