Saying yes to something you don’t want to do can save you the discomfort of saying no, but ultimately it’s like cheating on a diet. You get fleeting pleasure (or in the case of saying yes, temporarily escape discomfort) now at the expense of your long-term well-being. In addition to that, in the case of saying yes, you risk feeling resentful toward the person who asked you to do something you didn’t want to do.