To know, is to know that you know nothing. That is the meaning of true knowledge.

The more I see the less I know for sure.

Learning is the only thing the mind never exhausts, never fears, and never regrets.

I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.

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.

Art is the queen of all sciences communicating knowledge to all the generations of the world.