How many hours do you think you waste every week complaining about things that happened to you that are out of your control? How much time do you spend worrying about things that might happen that you couldn’t possibly predict or prevent? How many minutes a day do you allow yourself to read articles and social media posts that piss you off but have nothing to do with your life? How many times have you gotten angry in traffic and carried that negative emotion with you into the office, or the classroom, or through your front door at home?
–Arnold Schwarzenegger, Be Useful: Seven Tools for Life, 168
