In 1960, E. Käsemann wrote his now well-known essay, Die Anfänge christlicher Theologie’, in which he set out to explore the terra incognita of Christian beginnings. His objective was to allow ‘full validity’ to any ‘alien element’ he might find there. Käsemann identified the alien element he discovered as ‘apocalyptic’. The conclusion Käsemann drew from this discovery, spelled out in his first paper and its sequel, ‘Zum Thema der urchristlichen Apokalyptic’, was that this ‘apocalyptic…was the mother of all Christian theology’.