Tertullian must have had ample means, then, of ascertaining the facts concerning the books of the New Testament from living witnesses. There is again another point we must bear in mind, and it is this: the distance of time with which Tertullian's investigations had to deal was not so vast as we sometimes imagine. It was by no means so great as the spaces we have just now referred to. We naturally think of Tertullian as living about the year 200, and then, remembering that our Saviour was born just two centuries before, we ask, What is the value of a man's testimony concerning events two centuries old? But we must bear in mind the exact point at issue. We are not enquiring at all about events two centuries old, but we are enquiring as to Tertullian's evidence with respect to the canonical Gospels and the Acts; and none of these was one hundred years old when Tertullian was born, about 150 A.D., while the Gospel of St. John may not have been more than sixty years old, or thereabouts, at the same date. Now if we take up the writings of Tertullian, which are very copious indeed, we shall find that the Acts of the Apostles are quoted at least one hundred times in them, long passages being in some cases transcribed, and the whole book treated by him as Scripture and true history. If we accept the ordinary view, that the Acts were written previously to St. Paul's death, the book was only a century old at Tertullian's birth. But we can come nearer to the apostolic times. The Muratorian Fragment is a document which came to light by chance one hundred and fifty years ago. It illustrates the age of the Acts, and shows what wondrous testimonies to the New Testament scriptures we may yet gain. Its story is a very curious and interesting one for ourselves. St. Columbanus was an Irish missionary who, about the year 600 A.D., established a monastery at Bobbio, a retired spot in North Italy. He gathered a library there, and imparted a literary impulse to his followers which never left them.[13] Some Irish monk a hundred years later than Columbanus employed his time in copying into a book an ancient manuscript of the second century giving a list of the books of the New Testament then received at Rome. This second-century manuscript enumerated among these the four Gospels, the Acts of the Apostles, and thirteen Epistles of St. Paul. Concerning the Acts of the Apostles, the Roman writer of this document, who lived about A.D. 170, says: "The Acts of all the Apostles are written in one book. Luke explains to the most excellent Theophilus everything which happened in his presence, as the omission of Peter's martyrdom and of Paul's journey into Spain manifestly proves;" a passage which clearly shows that about the middle of the second century the Acts of the Apostles was well known at Rome, and its authorship ascribed to St. Luke.[14] But this is not all. We have another most interesting second-century