The things that Tommy John could change—when he had a chance—got a full 100 percent of the effort he could muster. He used to tell coaches that he would die on the field before he quit. He understood that as a professional athlete his job was to parse the difference between the unlikely and the impossible. Seeing that minuscule distinction was what made him who he was. To harness the same power, recovering addicts learn the Serenity Prayer.