Attention to health is life greatest hindrance.

A wise ignorance is an essential part of knowledge.

Education and admonition commence in the first years of childhood, and last to the very end of life.

Nothing in human affairs is worth any great anxiety.

To the rulers of the state then, if to any, it belongs of right to use falsehood, to deceive either enemies or their own citizens, for the good of the state: and no one else may meddle with this privilege.

The makers of fortunes have a second love of money as a creation of their own, resembling the affection of authors for their own poems, or of parents for their children, besides that natural love of it for the sake of use and profit.

It is through geometry that one purifies the eye of the soul.