“To master saying no, you may have to move out of your comfort zone. While saying no won’t change your personality, it will help you assert yourself and put an end to that empty feeling in the pit of your stomach when you commit beyond your stamina or to the point of draining your emotional reserves. Over time and with practice, no will become your first option instead of a current, deeply ingrained propensity to say yes.”
This quote is from “The Book of No”
Susan Newman.