One of the most trying times in my career was when we did the first heart transplant. We put it into the patient, and wondered whether it was going to work. Suppose it had not functioned? We weren’t certain at all that it would function. So that five or ten minutes, while we were waiting for that heart to regain its function, was one of the most difficult times of my surgical career. And I’m sure it’s the same with other surgeons who have followed. Now we know that the heart will start up, and that’s just part of the knowledge that we have gained through the years.