Leadership is about inspiring others to see possibilities where they once saw obstacles.

Efficiency is highly overrated； Goofing off is highly underrated. Regularly scheduled sabbaths， sabbaticals， vacations， breaks， aimless walks and time off are essential for top performance of any kind. The best work ethic requires a good rest ethic.

The process of solving a mathematical problem is often more important than the solution itself.

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

如果自己道德高尚，就不会被外界不正的东西所迷惑。