"And those who believe that in the life and teaching of Jesus God has given a unique revelation of His character and purpose are committed by this belief, whether they like it or not, whether they admit it or not, to that quest. Without the Jesus of history the Christ of faith becomes a Docetic figure, a figment of pious imagination, who, like Alice’s Checshire cat, ultimately disappears from view."
G.B. Caird, New Testament Theology (ed. L.D. Hurst; Oxford: Clarendon, 1994), p. 347
“We must continually return to the historical Jesus and his message. The sources demand it; the kerygma, which refers us back away from itself, also demands it. To put it in theological terms, the incarnation implies that the story of Jesus is not only a possible subject for historical research, study, and criticism, but demands all of these. We need to know who the Jesus of history was, as well as the content of his message.”
Joachim Jeremias, “The Search for the Historical Jesus,” in Jesus and the Message of the New Testament (ed. K.C. Hanson; Minneapolis: Fortress, 2002), p. 8