The ostensible object of "Ad Autolycum" is to convince a pagan friend, Autolycus, a man of great learning and an earnest seeker after truth, of the divine authority of the Christian religion, while at the same time exhibiting the falsehood and absurdity of paganism. His arguments, drawn almost entirely from the Old Testament, with but very scanty references to the New Testament, are largely chronological. He makes the truth of Christianity depend on his demonstration that the books of the Old Testament were long anterior to the writings of the Greeks and were divinely inspired. Whatever truth the pagan authors contain he regards as borrowed from Moses and the prophets, who alone declare God's revelation to man. He contrasts the perfect consistency of the divine oracles, which he regards as a convincing proof of their inspiration, with the inconsistencies of the pagan philosophers. He contrasts the account of the creation of the universe and of man, on which, together with the history contained in the earlier chapters of Genesis, he comments at great length but with singularly little intelligence, with the statements of Plato, "reputed the wisest of all the Greeks", of Aratus, who had the insight to assert that the earth was spherical, and other Greek writers on whom he pours contempt as mere ignorant retailers of stolen goods. He supplies a series of dates, beginning with Adam and ending with Marcus Aurelius, who had died shortly before he wrote, thus dating this work to the years of the reign of Commodus, 180-92.