Discipline is the differentiator.

You think you know the difference between a hero and a coward, Mike? Well, there is no difference between a hero and a coward in what they feel. It’s what they do that makes them different. The hero and the coward feel exactly the same, but you have to have the discipline to do what a hero does and to keep yourself from doing what the coward does.

– Cus D’Amato, Mike Tyson’s Trainer