DESIRE. To wish or long for the possession or enjoyment of something that a person's appetite does not presently have. Desires are natural if they proceed from man's inborn lack of what he needs; they are supernatural when inspired by divine grace. Man's fallen nature has desires that incline to what is sinful, but, so far from being sinful, these desires of concupiscence are a source of merit provided they are controlled according to the will of God.