Remember the 'Parable of the Talents' in the New Testament? Christ exhorts us to be the best we can be by developing our skills and abilities, by succeeding in all our tasks and endeavors. What better description can there be of capitalism?
At the risk of some oversimplification, if the skill composition of our work force meshed fully with the needs of our increasingly complex capital-stock, wage-skill differentials would be stable, and the percentage changes in wage rates would be the same for all job grades.