After a long, thorough, and startling examination of their Books, together with all the answers to them he could obtain from a Library amply furnished in this respect, he was finally very reluctantly compelled to feel persuaded, by proofs he could neither refute, nor evade, that how easily soever Christians might answer the Deists, so called, the Jews were clearly too hard for them.
Because they set the Old and New Testament in opposition, and reduce Christians to this fatal dilemma .-- Either the Old Testament contains a Revelation from God; or it does sot.

If it does, then the New Testament cannot be from God, because it is palpably, and importantly repugnant to the Old Testament in doctrine, and some other things.

Now Jews, and Christians, each of them admit the Old Testament as containing a divine Revelation; consequently the Jews cannot, and Christians ought not to receive and allow any thing as a Revelation from God which flatly contradicts a former by them acknowledged Revelation: because it cannot be supposed that God will contradict himself.

On the other hand--if the Old Testament be not from God, still the New Testament must go down, because it asserts that the Old Testament is a revelation from God, and builds upon it as a foundation.

And if the foundation fails, how can the house, stand?
The Author pledges himself to the Reader, to prove, that they establish this dilemma completely.