I believe that works that touch the Divine or teach us or are still with us centuries after their creation are the ones that did not come out of a place of power or control or techniques, but came at the moment when the heart let go and God answered the question.
Every one of us has a "good work" to do in life, which accomplishes something needed in the world while completing something in us. When it is finished a new work emerges which will help us to make green a desert place, as well as to scale another mountain in ourselves. The work we do in the world, when it is a true vocation, always corresponds in some mysterious way to the work that goes on within us.