"In the darkest times, even the smallest acts of kindness can shine like stars."

We are all given one thing by which our lives are measured, one determination.

一个好的数学家总是准备好进行概括。

"A poem is a small machine made out of words."

儿童有着他自己的人格，他自身具有创造精神的美和尊严。这种美和尊严是永远不能磨灭的，所以他的纯洁而非常敏感的心灵需要我们最审慎的爱护。

The most considerable difference I can see between men and animals is not in reason, but in the extent of the power of using it.  

The only limit to our understanding of the universe is our imagination.

幸福的秘密是自由，自由的秘密是勇气。