And now I have to defend myself against the second class of opponents, and to embark on the investigation it requires. It has to do with those of the Circumcision, it has not yet been investigated, but I hope in time to dispose of it in the present work on the Proof of the Gospel. And so now with an invocation of the God of Jews and Greeks alike in our Saviour's Name we will take as our first object of inquiry, what is the character of the religion set before Christians. And in this same inquiry we shall record the solutions of all the points investigated.