It’s near impossible to beat someone who just doesn’t give up. I learned that racing marathons: you hit a wall, you feel awful, you may think you're done—and then somehow you find another gear. The same thing happens as a founder. And as an investor. You can believe something long before the rest of the world catches up. Sometimes it takes years, sometimes it shows up in a form you never imagined. But if you stick with it, the payoff is real. Stamina compounds.