Why is a virtue called a virtue? Because it brings happiness. It is not because it is a particular kind of action, it is because it brings to one what one's whole being is desiring. It brings freedom, it brings the air of happiness; it gives by its pressure upon one's mind an increase of will-power, that is why it is called virtue. It is therefore that no person in the world can judge another person, whether superior to him in evolution or inferior; the person himself is the best judge of his action.