That all human affairs and all historical events are relative is the significant spiritual persuasion of our age. Both the encounter of mankind with history and the meeting of the hitherto widely dispersed parts of the human race have focused before our eyes in a very dramatic way not only the unity of mankind but also the relativity and historical interdependence of all human institutions and undertakings. Everything considered unique is matched by its parallel elsewhere, and everything considered absolute manifests a temporal dependence upon historical factors. Christianity is no exception to this general experience.
(Translated from German by Emmanuel Lantin)