"The past is never dead. It's not even past."

发现可能性的极限的唯一方法是超越它们进入不可能。

"Children's books should be both a mirror and a window."

Given the choice between the experience of pain and nothing, I would choose pain.

数学是科学大厦的基础。

人心比山川更险恶，比了解天象更困难。

保证失败的最好方法就是放弃。