‘Much of what the Gospels tell us about Jesus, his teaching, healings and other miracles, are not mentioned in Irenaeus’ rule of faith and would not be mentioned in later creeds either. Rudolf Bultmann claimed that in John’s gospel, ‘the Proclaimer became the Proclaimed’, in other words that Jesus went from being the one who spoke of the coming kingdom of God, and taught people how to live in its light, to being himself the content of the Christian proclamation. Instead of a gospel preached by Jesus, Christians came to believe in a gospel about Jesus. This development had certainly advanced even further by the time of Irenaeus (born 130 AD), whose rule of faith sees Jesus as the person the Christian message is about.’
~ John Barton A History of the Bible, p. 328
John Barton was Professor of the Interpretation of Holy Scripture at the University of Oxford from 1991 to 2014 and since 1973 has been a serving priest in the Church of England. He is the author of numerous books on the Bible, co-editor of The Oxford Bible Commentary and editor of The Cambridge Companion to Biblical Interpretation.