That happens more than you think, because this is not just engineering and science. There is art, too. Sometimes when you’re in the middle of one of these crises, you’re not sure you’re going to make it to the other end. But we’ve always made it, and so we have a certain degree of confidence, although sometimes you wonder. I think the key thing is that we’re not all terrified at the same time. I mean, we do put our heart and soul into these things. (Steve Jobs)