I haven't read much of Abraham Kuyper, but he's on my list. I was recently reminded of a quote of his which carries new meaning with me (at least I understand it anew) with our recent projects. I really believe that this is one of the most important truths which the Church must recover:
"There is not one square inch in the whole domain of our human existence over which Christ, who is Sovereign over all, does not cry: Mine!"
The Church is not for religion, and business for economics, and politics for the state. To Christ, there are no such limits. "Give to Caesar what is Caesar's, and to God the things that are God's." And what is His? Everything.