The Joyful Wisdom · Friedrich Wilhelm Nietzsche
120.
_Health of the Soul._—The favourite medico-moral formula (whose originator was Ariston of Chios), "Virtue is the health of the soul," would, at least in order to be used, have to be altered to this: "Thy virtue is the health of thy soul." For there is no such thing as health in itself, and all attempts to define a thing in that way have lamentably failed. It is necessary to know thy aim, thy horizon, thy powers, thy impulses, thy errors, and especially the ideals and fantasies of thy soul, in order to determine _what_ health implies even for thy _body_. There are consequently innumerable kinds of physical health; and the more one again permits the unique and unparalleled to raise its head, the more one unlearns the dogma of the "Equality of men," so much the more also must the conception of a normal health, together with a normal diet and a normal course of disease, be abrogated by our physicians. And then only would it be time to turn our thoughts to the health and disease of the _soul_ and make the special virtue of everyone consist in its health; but, to be sure, what appeared as health in one person might appear as the contrary of health in another. In the end the great question might still remain open: whether we could _do without_ sickness, even for the development of our virtue, and whether our thirst for knowledge and self-knowledge would not especially need the sickly soul as well as the sound one; in short, whether the mere will to health is not a prejudice, a cowardice, and perhaps an instance of the subtlest barbarism and unprogressiveness. _Life no Argument._—We have arranged for ourselves a world in which we can live—by the postulating of bodies, lines, surfaces, causes and effects, motion and rest, form and content: without these articles of faith no one could manage to live at present! But for all that they are still unproved. Life is no argument; error might be among the conditions of life.
Text from Project Gutenberg, public domain in the United States.