A mathematician's work is never done; there are always new questions to ask and new mysteries to solve.
数学家的工作永无止境;总有新的问题要问,新的谜题要解。
别害怕独自站立。
心理学是精神生活的科学。
"The best children's books are the ones that make children think."
To die for one's country is such a worthy fate that all compete for so beautiful a death.