在数学中，提出问题的艺术必须比解决问题更有价值。
In mathematics, the art of proposing a question must be held of higher value than solving it.
心灵需要书本，就像一把剑需要磨刀石。
抽象的力量使数学能够超越物理现实的限制。
Democracy is the worst form of government except all those other forms that have been tried from time to time.
战略的本质是你必须对想要完成的事情设定限制。