"Hope is the thing with feathers that perches in the soul."

识别你的问题，但把你的力量和能量投入到解决方案中。

一本好书的标准在于它能在多大程度上扰乱和困扰读者。

在数学中，提出问题的艺术必须比解决问题更有价值。

I think of a hero as someone who understands the degree of responsibility that comes with his freedom.