Rhodo had probably brought forward against Apelles proof from prophecy which led to the discussion of the Old Testament prophecies in general. Although Apelles had rejected Marcion’s dualism, and accepted the “one principle,” he still rejected the Old Testament. This is quite peculiar, and yet perfectly comprehensible; for while Marcion was indeed the only one of that age that understood Paul, yet as Harnack well says, even he misunderstood him; and neither himself nor his followers were able to rise to Paul’s noble conception of the Old Testament law as a “schoolmaster to bring us to Christ,” and thus a part of the good God’s general plan of salvation. It took, perhaps, a born Jew, as Paul was, to reach that high conception of the law in those days. To Marcion and his followers the law seemed to stand in irreconcilable conflict with the Gospel,—Jewish law on the one side, Gospel liberty on the other,—they could not reconcile them; they must, therefore, reject the former as from another being, and not from the God of the Gospel. There was in that age no historical interpretation of the Old Testament. It must either be interpreted allegorically, and made a completely Christian book, or else it must be rejected as opposed to Christianity. Marcion and his followers, in their conception of law and Gospel as necessarily opposed, could follow only the latter course. Marcion, in his rejection of the Old Testament, proceeded simply upon dogmatic presumptions. Apelles, although his rejection of it undoubtedly originated in the same presumptions, yet subjected it to a criticism which satisfied him of the correctness of his position, and gave him a fair basis of attack. His procedure was, therefore, more truly historical than that of Marcion, and anticipated modern methods of higher criticism.