The more it gets, the more it wants. King Solomon began his reign as a man of God, full of wisdom and splendor. Everything is meaningless. He had quenched every physical appetite, but it was in vain. Howard Hughes and John Paul Getty did the same in this generation.
Self is a good servant, but as a master it is a tyrant.
Selfishness is never satisfied until it completely consumes. My way doesn't pay, it costs. King David allowed his lust for a woman to lead him to adultery. But the effect of his sin spread to his children and the whole nation of Israel. Anyone who remains very close to a self-centered person will have to bear some of the consequences of his actions, even though they are innocent.