" But take notes on the things that give you joy and satisfaction, and start investing in those things. Pay special attention to things that bring you joy that don’t involve mind-altering substances or a lot of money. Whether it’s cooking, capoeira, the guitar, or mountain biking, interests and hobbies add texture to your personality. Being “in the zone” is happiness. You lose the sense of time, forget yourself, and feel part of something larger. "

― Scott Galloway , The Algebra of Happiness: Finding the Equation for a Life Well Lived