But since one would esteem it almost incredible, that the apostles could persuade men to believe Jesus to be this Messiah, unless they had at least some proof to offer to their conviction, let us next consider, and examine, the proofs adduced by the apostles and their followers, from the Old Testament for that purpose. Of the strength or weakness of the proofs for Christianity out of the Old Testament, we are well qualified to judge, as we have the Old and New Testament in our hands; the first containing what are offered as proofs of Christianity, and the latter the application of those proofs, and we should seem to have nothing more to do, but to compare the Old and New Testament together. But these proofs taken out of the Old Testament, and urged in the New, being sometimes not to be found in the Old, nor urged in the New, according to the literal and obvious sense, which they appear to bear in their supposed places in the Old, and, therefore, not proofs according to the rules of interpretation established by reason, and acted upon in interpreting every other ancient book-- almost all Christian commentators on the Bible, and advocates for the religion of the New Testament, both ancient and modern, have judged them to be applied in a secondary, or typical, or mystical, or allegorical, or enigmatical sense; that is, in a sense different from the obvious and literal sense which they bear in the Old Testament. Thus, for example, Matthew, after having given an account of the conception of Mary, and the birth of Jesus, says (ch. i.,) "All this was done that it might be fulfilled which was spoken by the prophet, saying, Behold a virgin shall be with child, and shall bring forth a son, and they shall call his name Immanuel." But the words as they stand in Isaiah ch. vii. 14, from whence they are taken, do, in their obvious and literal sense, relate to a young woman in the days of Ahaz, King of Judah, as will appear, considering the context.