Video (c) Ford Motor Company, National Archives
Rivera is an incredible example of what it means to truly put in work. If you've ever worked on a mural, you know it takes hours on hours of sweat, sometimes teetering on high ledges, sometimes bent low to the ground, trying to keep balance while keeping your lines clean. It's tons of fun, mind you, but it's definitely work.
Rivera wouldn't be Rivera if he didn't put in the work.
I try to remember that when I'm getting out of my side job late at night and I still have illustrations to finish and emails to write.