DH has this on the wall of his painting studio for a while, and I recently pasted a copy in my daily planner. It reminds me to make sure that my thoughts are going in a worthwhile direction. The quote is from a sports psychologist/consultant named Fannin.
"Superstars don't think like everyone else. The average person has 2,000 to 3,000 thoughts a day, and 60 percent of the average person's thoughts are in chaos. The superstar has 1,100 thoughts per day. They eliminate worry, envy, jealousy, embarrassment and anger. The superstar thinks a lot less and holds a thought longer."
Don't know how they measure the frequency of a person's thoughts, but I'm very willing to cut down on worry, envy, etc, or at least to try.