Jocko Willinik has what he calls Destroyer Mode: a mode of operating where your adrenaline takes over and no matter what you do not stop until a job is done. This overdrive-mode is where you’re operating at your fullest potential. And it requires maximizing your emotional and logical capacities.
You need both. They can’t both succeed at the same time. At some point, you’ll hit your limit and your mind will think it’s time to quit. That’s when you leverage your emotional capacity to keep pushing.
When one fails, you need to rely on the other.
Source: Discipline Equals Freedom