He tries to achieve perfection, even though he knows that perfection can never be achieved. Help of this frame of mind, he will always get better and better but the perfection requires time, out there all projects have deadlines so some times you have to stop and he knows that, eventually all projects are not ready in the eyes of those who made them but they are ready for customers. He learns very fast so don't be bothered if he doesn't have the skill that you seek for.