I feel that very rarely have I done any work in my life. I have a good time. I'm exploring. I'm playing a game, solving puzzles, and having fun, and for some reason people have been willing to pay me for it. Officially, I was supposed to retire years ago, but retire from what? Why stop having a good time?
As quoted in Charles Townes, Inventor of the Laser, Nobel Laureate, Believer (2015)