A sound mind in a sound body is a short but full description of a happy state in this world.
John LockeHow much education may reconcile young people to pain and sufference, the examples of Sparta do sufficiently shew; and they who have once brought themselves not to think bodily pain the greatest of evils, or that which they ought to stand most in fear of, have made no small advance toward virtue.
John LockeThe greatest part of mankind ... are given up to labor, and enslaved to the necessity of their mean condition; whose lives are worn out only in the provisions for living.
John Locke