For the dispute of the Jew with the Christian is one thing, and his dispute with the sceptic is another, totally different.
For whether such a personage as the Messiah is described to be, has appeared eighteen hundred years ago, is quite a different thing from the question, whether such a personage will appear at all.

The Christian says, that he has appeared in the person of Jesus of Nazareth.

This the Jew denies, but looks forward to the future fulfilment of the promises of his Bible, while the Sceptic denies that the Messiah has come, or ever will.
But the subject at present under consideration is the dispute of the Jew with the Christian, who acknowledges the Old Testament to be a Revelation, upon which a new Revelation, that of the New Testament, is founded and erected.

To him the Jew argues, that if the Old Testament be a Divine Revelation, then the New Testament cannot be a Revelation, because it contradicts, and is repugnant to, the Old Testament, the more ancient, and acknowledged Revelation.

Now God cannot be the author of two Revelations, one of which is repugnant to the other.