问题陈述得好，问题就解决了一半。

数学是理性的音乐。

If you want something you've never had, you must be willing to do something you've never done.

自然不作飞跃。（拉丁文，指自然界的演变是连续的而非跳跃的）

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.

Enterprises must have the spirit of self-revolution.

智者和愚人都没有害，最危险的倒是智愚参半。