To be a professional.

This is a quote from A.L. Carr's novel A Month in the Country. Penguin Books, 2000

You know how it is when a tricky job is going well because you're doing things the way they should be done, when you're working in rhythm and feel a reassuring confidence that everything's unravelling naturally and all will be right in the end. That's about it: I knew what I was doing - it's really what being professional means.