Essentialism is Greg McKeown's manifesto for the disciplined pursuit of less (but better). The nutshell catch fraise of the book is "if it's not a hell yes, it's a no". The author advocates clearly identifying and hyper-focusing on what you do best and what really matters to you so that you can deliver your highest possible contribution.
Start saying "no" more often and you will live in peace. If you are busy, you are not in control of your life. If you let other people take your time away, you will die a busy, unhappy person. I went "from default to yes to 'hell no'" and I recommend you to do the same.
“Remember that if you don’t prioritize your life someone else will.”
“Essentialism is not about how to get more things done; it’s about how to get the right things done. It doesn’t mean just doing less for the sake of less either. It is about making the wisest possible investment of your time and energy in order to operate at our highest point of contribution by doing only what is essential.”
“What if we stopped celebrating being busy as a measurement of importance? What if instead we celebrated how much time we had spent listening, pondering, meditating, and enjoying time with the most important people in our lives?”