Music... is the shaping of the invisible.

A good painter is to paint two main things, men and the working of man's mind.

Nothing is so much to be feared as Evil Report.

The earth is moved from its position by the weight of a tiny bird resting upon it.

This work should commence with the conception of man, and should describe the nature of the womb, and how the child inhabits it, and in what stage it dwells there, and the manner of its quickening and feeding, and its growth, and what interval there is between one stage of growth and another, and what thing drives it forth from the body of the mother, and for what reason it sometimes emerges from the belly of its mother before the due time.

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

Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.