Nearly all of us would say that the miser is a fool and that his life is utterly miserable. Our agreement here is based on our recognition of the fact that man has certain natural needs. These should be satisfied. The things which satisfy these natural needs are really good for us. For example, knowledge is one of the real goods because all men by nature desire to know.
Friendship is another real good because man is social by nature and craves love.
Food, clothing, and shelter are real goods because of our biological needs. These things are good and necessary for all men, whether they consciously desire them or not. A man may say that he has everything he wants, when he has wealth or power or fame, but that does not change the objective facts about what he really needs in order to lead a good human life. He is like a man who is suffering from hidden malnutrition while indulging himself in a diet he likes. If moral philosophy is to have a sound factual basis, it is to be found in the facts about human nature and nowhere else.