Advertisers constantly invent cures to which there is no disease.

Study without desire spoils the memory, and it retains nothing that it takes in.

Drawing is based upon perspective, which is nothing else than a thorough knowledge of the function of the eye.

Nature is so delightful and abundant in its variations that among trees of the same kind there would not be found one which nearly resembles another, and not only the plants as a whole, but among their branches, leaves, and fruit, will not be found one which is precisely like another.

Experience, the interpreter between creative nature and the human race, teaches the action of nature among mortals: how under the constraint of necessity she cannot act otherwise than as reason, who steers her helm, teaches her to act.

Art lives from constraints and dies from freedom.

A day will come in which men will look upon an animal's murder the same way they look today upon a man's murder.