I am convinced that being fully committed to the moment, without any worries about the past or projections into the future, is the best attribute a closer can have. You wonder why the shelf life of so many short relievers is, well, so short? Why guys can be unhittable for a year or two and then disappear? It's because it takes a ton of concentration, and self-belief, to stay in the moment in this way and not let the highs and lows mess with your psyche.