In various part of the New Testament, notably in the epistles of Paul, the Epistle to the Hebrews, and the Gospel and Epistles of John, we have a theological edifice constructed upon this plan. The style of building differs considerably. The theology of Paul, of John, and of the author to the Hebrews, though based upon a common tradition of the centre, is far from uniform. As church architecture, based upon a universal general plan, may show the various characteristics of Romanesque, Gothic or Baroque, so each of these theologians builds after his own style. It is a great merit of modern critical study of the New Testament that it has made us appreciate the individuality of the great theologians of the apostolic age, and the rich diversity of their teaching. The question now before us is this: Granted that each of these early thinkers followed the general tradition embodied in the apostolic kerygma, and faithfully conserved its main outline, have they anything in common beyond the bare outline? To put it otherwise, given the ground-plan, and the majestic buildings erected to its pattern, can we find a substructure—a part of the actual edifice—which is common to them all, or are the several buildings individually different from the foundation up?