A diamond is just a lump of coal that stuck to its job.

The eye is the window of the human body through which it feels its way and enjoys the beauty of the world.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer. Go some distance away because then the work appears smaller and more of it can be taken in at a glance and a lack of harmony and proportion is more readily seen.

A good painter has two main objects to paint, man and the intention of his soul.

Inequality is the cause of all local movements.

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

The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.