So, then, one would assume, he must accept the testimony of the same Christian group to the apostolic origin of Tradition, which was included over and over again in the writings of the early Christians:
“Papias [A.D. 120], who is now mentioned by us, affirms that he received the sayings of the apostles from those who accompanied them, and he, moreover, asserts that he heard in person Aristion and the presbyter John. …” (fragment in Eusebius, *Church History *3:39 [A.D. 312]).
Eusebius - “At that time [A.D. 150] there flourished in the Church Hegesippus, whom we know from what has gone before, and Dionysius, bishop of Corinth, and another bishop, Pinytus of Crete, and besides these, Philip, and Apollinarius, and Melito, and Musanus, and Modestus, and, finally, Irenaeus. From them has come down to us in writing, the sound and orthodox faith received from tradition” (*Church History *4:21). Notice the “writing” here is not Scripture, but writings formed from tradition.
Irenaeus - “That is why it is surely necessary to avoid them [heretics], while cherishing with the utmost diligence the things pertaining to the Church, and to lay hold of the tradition of truth. . . . What if the apostles had not in fact left writings to us? Would it not be necessary to follow the order of tradition, which was handed down to those to whom they entrusted the churches?” (ibid., 3:4:1).
…
"But since it would be too long to enumerate in such a volume as this the successions of all the churches, we shall confound all those who, in whatever manner, whether through self-satisfaction or vainglory, or through blindness and wicked opinion, assemble other than where it is proper, by pointing out here the successions of the bishops of the greatest and most ancient church known to all, founded and organized at Rome by the two most glorious apostles, Peter and Paul, that church which has the tradition and the faith which comes down to us after having been announced to men by the apostles.
“With this church, because of its superior origin, all churches must agree—that is, all the faithful in the whole world—and it is in her that the faithful everywhere have maintained the apostolic tradition” (ibid., 3:3:1–2).
There’s lots more I could quote here, but to conserve space, I will refer readers to the excellent collection in the tract on Tradition in the Catholic Answers library. Now, going by Fredericks’ proof, as offered in his post, that the testimony of the early Church is proof of the apostolic origin of Scripture, I think that we all owe him a big thank-you for effectively proving the apostolic origin of Tradition through that same reasoning. And since we maintain that Tradition teaches the same thing as Scripture (you will have to bring in development of doctrine, which is not “Tradition”, in another thread), there is no need to provide proof for these “extra-Biblical” teachings he claims we must believe.
continued …