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I don’t worry about motivation, because motivation comes and goes. It’s just a feeling. You might feel motivated to do something, and you might not. The thing that keeps you on course and keeps you on the warrior path isn’t motivation. It is discipline. Discipline gets you out of bed. Discipline gets you onto the pull-up bar. Discipline gets you to grind it out in jiu-jitsu class. If you do those things only when you are motivated to do them, you might do them only fifty percent of the time. Sure, it’s nice when motivation is there, but you can’t count on motivation. You have to rely on the personal discipline you develop. Like you said: Discipline equals freedom. Got it?
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Jocko Willink (Way of the Warrior Kid: From Wimpy to Warrior the Navy SEAL Way: A Novel)