My iPhone sometimes displays this error message, which has become my favorite. The message carries with it both a sense of calm and an opportunity to pause in the moment. Really. At this moment, everything is OK. That cookie I had during my afternoon slump? Nothing to undo. The moment I lost patience with someone? Nothing to undo. My frustration with not being able to keep my computer from crashing? Nothing to undo. This moment is perfect. There is nothing to undo.