The Healing Power of Saying No

The healing power of saying no. "What, are you stingy?", "give in, you are a girl", "give in, you are a boy", "give in, you are older", "give in, you are smarter", "stingy", "God commanded to share"... Did you hear familiar voices? I did. For middle-aged people (and older), it's usually very easy to give in: years of training. The worse thing is something else: where is the limit? How many times should one give in? How many times to share? How many times to lend? When to ask for money back? How to do it without offending anyone?