Have you ever been to a party and eaten so much candy, so much pizza, and drunk so much soda that your tummy hurt afterward? We feel sick, want to lie down, and miss out on playing, right?
The Bible says the wise man knows when to stop. Whoever is greedy or has no control ("gorges themselves") ends up feeling sick and "poor" in joy. God wants us to enjoy the food and the party, but without overdoing it. Self-control makes the fun so much better!