In fact, whatever exists in the universe, in essence, in appearance, in the imagination, the painter has first in his mind and then in his hands ... it lies in his power to create them . . .

Life well spent is long.

Nothing will be left, Nothing in the air, nothing under the earth, nothing in the waters. All will be exterminated.

When the sun is covered by clouds, objects are less conspicuous, because there is little difference between the light and shade of the trees and the buildings being illuminated by the brightness of the atmosphere which surrounds the objects in such a way that the shadows are few, and these few fade away so that their outline is lost in haze.

One day the world will look upon research upon animals as it now looks upon research on human beings.

We are deceived by promises and time disappoints us.

Poor is the pupil who does not surpass his master.