Happiness in Misery?

How many times do you say"yes" when you really mean "no"? You're doing someone a favor while you end up with a knot in your stomach and resentment in your heart, before you know it you're the one being miserable. We than point our fingers; complain and blame; would it not be easier to just say "no" and just be happy? Practice the art of saying "NO". It doesn't make you a bad person.