what I want you to get out of this is that not only can this rule be applied to your professional life, but also can be applied to your personal life. Find the 20% of people, and 20% of the things that you do in life and focus on that instead of doing mindless work searching for something else. If you're working, and you feel unhappy, try to find that 20% and only spend your time on that, don't focus outside that 20% and you'll find more time equal to more happiness to spend going out with your friends or your family, and this could also be applied to your hobbies. Find the 20% that truly makes you happy and focus on those.