For myself I am an optimist – it does not seem to be much use to be anything else.
我本人是个乐观主义者,因为做别的貌似没什么用。
To do mathematics is to explore a universe of ideas, where the only limit is your imagination.
释义：培养自己好的品德、性情，即使细微的地方，也一定要谨慎。
一个国家的真正财富不仅在于其土地，还在于其水域。
故事是我们教孩子如何以勇气和善意去探索世界的方式。
The writer must be a smuggler of truths, a clandestine agent of freedom.