Every successful startup has a half dozen times it's on the verge of failure. Any reasonable person would say it's over. But those with grit refuse to give in and find a way.

But I've also known founders who repeatedly fail, constantly survive crises. They lose their house, get divorced and still soldier on refusing to give up.

Both entrepreneurs have grit, but only the first one is successful. Grit is vital to winning but it's not the only thing you need.