Originally delivered as one of the Jowett Lectures for 1906, the contents of this booklet emerged during the first quest for the historical Jesus. Somewhat surprisingly, Burkitt discovered that historical criticism increased the historical credibility of the Synoptic Gospels in his estimation. This eighth lecture in the series addresses Marcion. Burkitt focuses on how this early Christian thinker remained ahead of his time while also falling out of the mainstream of what was an emerging Christianity.