Where there is shouting, there is no true knowledge.

Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.

He who wishes to be rich within a day, will be hanged within a year.

Wisdom is the daughter of experience

The acquisition of knowledge is always of use to the intellect, because it may thus drive out useless things and retain the good. For nothing can be loved or hated unless it is first known.

All our knowledge has its origins in our perceptions.