John Danaher on greatness, investment of time, and routine

BJJ coach to Georges St-Pierre, John Danaher, explains in GSP's autobiography "The Way of the Fight", that excellence is largely governed by routine:

All greatness comes out of an investment in time and the perfection of skills that render you great. And so, show me almost any truly great person in the world who exhibits some kind of extraordinary skills, and I'll show you a person whose life is governed largely by routine.