The motions of men must be such as suggest their dignity or their baseness.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer.

I shall do down in history as the man who opened a door!

Nature never breaks her own laws.

Painting is concerned with the ten things you can see: these are darkness and brightness, substance and color, form and place, remoteness and nearness, movement and rest.

Experiment is the sole interpreter of the artifices of Nature.

Details make perfection, and perfection is not a detail.