A sound mind in a sound body is a short but full description of a happy state in this world.
John LockePower to do good is the true and lawful act of aspiring; for good thoughts (though God accept them), yet towards men are little better than good dreams, except they be put in act; and that cannot be without power and place, as the vantage and commanding ground.
John LockeUnderstanding like the eye; whilst it makes us see and perceive all things, takes no notice of itself; and it requires art and pains to set it at a distance and make it its own subject.
John Locke