From this Rolling Stone piece, which you should read all of:
This is another lesson you need to learn if you desire to go beyond just coping, if actual happiness is one of your goals. In fact, not long ago, I was sitting in the kitchen of a fellow comedian where I saw a sign that brought that point home. It sat atop his cabinets, and read, “Forget What You Want, Look At What You Have.” I remember thinking that this man, who had a career like no one could ever hope to dream of, stand-up success, sitcom success, movie stardom, he’d even won an Oscar, and yet, he was humble, gracious, sincere, caring. He knew where happiness lay. He, who had so much, still knew what was important and what was not. “This guy,” I thought, “he’s really got it together.”
I miss him.