Excess generally causes reaction, and produces a change in the opposite direction, whether it be in the seasons, or in individuals, or in governments.

He who without the Muse's madness in his soul comes knocking at the door of poesy and thinks that art will make him anything fit to be called a poet, finds that the poetry which he indites in his sober senses is beaten hollow by the poetry of madmen.

The object of knowledge is what exists and its function to know about reality.

True friendship can exist only between equals.

There is a ... matter - much more valuable and divine than natural philosophy . ... On this matter I must speak to you in enigmas.

Until philosophers hold power, neither states nor individuals will have rest from trouble.

He who love touches walks not in darkness.