Persistence isn’t easy. It means picking yourself up, dusting yourself off, and screwing up the courage to head back into battle. But it’s funny; as I reflect on all my startup experiences, what I remember most vividly are not the big successes. Instead, I remember the hard times when things weren’t working. What makes persistence so rewarding is that wonderful feeling when you finally—on your hundredth attempt—finally do figure out that way to make it work.