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The quest for the historical Jesus, begun during the Enlightenment to purge the Gospels of "superstition" by subjecting them to critical reason, has since sought to situate him within his own time and place. That endeavor has proved troublesome. Historians depend on records, the best of which are produced contemporaneously with the events they relate, but most documentation about Jesus is neither collateral nor detailed. Although the Gospels offer abundant information and appear to contain primary-source material, they are not firsthand testimonies, and determining to what degree they may include unmediated reports about Jesus has generated substantial disagreement.
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Charles L Cohen (The Abrahamic Religions: A Very Short Introduction (Very Short Introductions))