You Don't Have to Say Yes to Something a Thousand Times

If you put up boundaries in the right place and make yourself less available, people actually value you more because of the principle of scarcity. And as a news flash for people, even if you said yes to something a thousand times, you are well within your rights to say no the next time. You are not on the hook to say it until all eternity. It's like you are allowed to evolve."