For this reason, they must believe in the cause for which they are fighting. - Jocko Willink

Because emotion and logic will both reach their limitations. And when one fails, you need to rely on the other. When it just doesn’t make any logical sense to go on, that’s when you use your emotion, your anger, your frustration, your fear, to push further, to push you to say one thing: I don’t stop.

In protecting my boat crew, I actually sheltered a couple of perpetual underperformers who dragged the rest of the boat crew down. When Hell Week was over, talking to some of the other members of our boat crew, we realized we had carried along these mentally weak performers. They almost certainly would not have met the standards otherwise. That loyalty was misguided. If we wouldn’t want to serve alongside our boat crew’s weakest performers once we were all assigned to SEAL platoons in various SEAL Teams, we had no right to force other SEALs to do so. The instructors were tasked with weeding out those without the determination and will to meet the high standards of performance. We had hindered that.

The test is not a complex one: when the alarm goes off, do you get up out of bed, or do you lie there in comfort and fall back to sleep? If you have the discipline to get out of bed, you win — you pass the test. If you are mentally weak for that moment and you let that weakness keep you in bed, you fail. Though it seems small, that weakness translates to more significant decisions. But if you exercise discipline, that too translates to more substantial elements of your life.