I wish to work miracles.

I roamed the countryside searching for answers to things I did not understand. Why shells existed on the tops of mountains. How the various circles of water form around the spot which has been struck by a stone, and why a bird sustains itself in the air.

Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.

Men of genius sometimes accomplish most when they work least, for they are thinking out inventions.

Patience serves as a protection against wrongs as clothes do against cold.

But to me all sciences seem vain and full of error that are not born of experience, mother of all certainty, and do not terminate in an actual experience.

The painter who has no doubt about his own ability will attain very little.