" The intimate connection between Christianity and Judaism - between the Old Israel and the New - is the central theme of the Catholic liturgy, so that the Two Testaments or Covenants are shown as integral parts of one divine experience. It is not merely that Israel was for more than a thousand years the unique vehicle of divine revelation, it is also that in the tradition of Israel a unique relation was established between God and man and human society and history, a relation which was not broken by the defection of Israel but was carried on and extended in the Christian Church and its history. Thus the Old and the New Testaments or Covenants form a single integrated development which has no parallel among the religions of the world. "

― Christopher Henry Dawson , The Formation of Christendom