The preservation of the means of knowledge among the lowest ranks is of more importance to the public than all the property of all the rich men in the country.

机会是一个没有意义的词；没有原因，什么也不能存在。

The true power of mathematics is not in its complexity, but in its simplicity and elegance.

How wonderful that we have met with a paradox. Now we have some hope of making progress.

Hard work and integrity are the cornerstones of any successful enterprise.