The only thing you have to do is pay taxes and die. It does help to feel good about the project and the work, but it is not a requirement for a fulfilling life.
Looking back at most times I have felt horrible in the depth of adversity, resistance or burnout I realize those were the times of greatest potential for achievement, learning and growth. Those are the memorable chapters, the things that define my character. The times when I continued to grind, continued to push through and didn't give up because of feelings were the times when I actually accomplished something: raised a kid, bought a house, switched continents.
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