"We can write a life of Julius Caesar or of Cicero, because we have in the first line letters, commentaries, and other authentic documents written by them and their friends; in the second, lives written by Plutarch and others who had in their hands monuments of them, now lost; and in the third, masses of contemporary coins and inscriptions. Contrast with this wealth of sources the scanty material which remains, after the examination of the preceding chapters, for a portrait of Jesus of Nazareth. So slender is it, indeed, that it seems not absurd to some critics to-day to deny that he ever lived."