“[Lou Gehrig] knew that getting comfortable was the enemy, and that success is an endless series of invitations to get comfortable. It’s easy to be disciplined when you have nothing. What about when you have everything? What about when you’re so talented that you can get away with not giving everything? The thing about Lou Gehrig is that he chose to be in control. This wasn’t discipline enforced from above or by the team. His temperance was an interior force, emanating from deep within his soul. He chose it, despite the sacrifices, despite the fact that others allowed themselves to forgo such penance and got away with it. Despite the face that it usually wasn’t recognized—not until long after he was gone anyway.”

Ryan Holiday, Discipline Is Destiny (Page 9)