"Children deserve books that challenge them, not just entertain."

"The only way to get rid of a temptation is to yield to it."

数学中的每一个问题都是学习新东西的机会。

Mathematics is the most beautiful and most powerful creation of the human spirit.

Some of life, you have to go to the great challenges.

If you want to be the best, you have to do things that other people aren't willing to do.

切东西的时候不要冲着自己。