On the bulletin board above my desk, I keep a handful of quotes that have taught me something, or that I hope to learn from.
Two very simple rules, a: you don’t have to write. b: you can’t do anything else.
—Raymond Chandler, in a 1949 letter
I love the simplicity of this advice. Don't succumb to distractions; let your mind be unoccupied. The work will happen.