What sets disciplined people apart? Here is what I’ve seen:
The capacity to get past distractions. There are players who get thrown by less than optimal conditions; they need perfect weather, a perfect playing surface, perfect health. There are other players who can’t be distracted. They can play on grass, turf, or the parking-lot blacktop—the only thing they focus on is the competition.
The willingness to condition mind and body for the task at hand. After a leader supplies the needed direction and knowledge base, it comes down to that old cliché: Who wants it more? Which side is prepared to push itself forward and seize the day?
The ability to keep your poise when those around you are losing theirs. Mature players will absorb these excesses in stride, even when they’re out-and-out flagrant. I tell my players to put their emotions on hold, to stone-face their opponents. Once the opposition knows what you’re thinking, it gains an advantage.
From "Finding A Way To Win" by Bill Parcells