最好的书是那些让你感觉不那么孤独的书。
过去是一个异国他乡;他们做事的方式不同。
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
孩子需要玩耍的自由和时间。玩耍不是奢侈品,而是必需品。