"We thought when we started Y Combinator that the most important quality would be intelligence. That's the myth in the Valley. And certainly you don't want foun

"We thought when we started Y Combinator that the most important quality would be intelligence. That's the myth in the Valley. And certainly you don't want founders to be stupid. But as long as you're over a certain threshold of intelligence, what matters most is determination. You're going to hit a lot of obstacles. You can't be the sort of person who gets demoralized easily."