O neglectful Nature, wherefore art thou thus partial, becoming to some of thy children a tender and benignant mother, to others a most cruel and ruthless stepmother? I see thy children given into slavery to others without ever receiving any benefit, and in lieu of any reward for the services they have done for them they are repaid by the severest punishments.

How painting surpasses all human works by reason of the subtle possibilities which it contains.

Where the spirit does not work with the hand, there is no art.

I am not to blame for putting forward, in the course of my work on science, any general rule derived from a previous conclusion.

Ask counsel of him who rules himself well.

Who would believe that so small a space could contain the images of all the universe?

Everything comes from everything, and everything is made out of everything, and everything returns into everything.