As for the Gospels,
St. Iranaeus of Lyons in Gaul (130/140-203AD) quotes the New Testament 1819 times,
Clement of Alexandria in Egypt (150-211AD) quotes the New Testament 2406 times, Tertullian of Carthage in North Africa (150/160-220AD) quotes the New Testament 7259 times. A German scholar by the name of Ronsch was able to reproduce most of the NT from the works of Tertullian alone.
Tatian (circa 120-180) was a writer who composed a book called “Diatesseron”, a harmony of the Gospels. He used all the Gospels to compose one continuous narrative of the Gospels. This was lost until 1888 when an Aarabic translation was found and edited by Ciasca. This is important because it shows that the texts of the Gospels of modern times are essentially the same as the ones that Tatian used when writing the Diatesseron around the middle of the 2nd century. Tatian first read the Gospels because of Justin Martyr, who converted him to Christianity. This means these Gospels go back to around 140 AD in Justin Martyr’s time. The first of the Gospels was written around 60-75AD, the period of time from 75-140 AD is too short of time for essential corruptions in the texts to come about. Von Soden (highly esteemed NT textual expert)agrees with that point.
The more diffused a writing is, then harder it will be for corruptions to sneak into the text in the process of transcription. If the text is diffused throughout an area, then corruptions would be quickly recognized and localized. There are several points that show that the Gospels were widely diffused as early as the first half of the 2nd century. Christians in the first half of the 2nd century were acquainted with the Gospels. Justin Martyr says that the Gospels were read to the people on Sundays at services.-
Code:
For the Apostles in the records which they have made and which are called the Gospels, have declared that Jesus commanded them to do as follows. “He took bread and gave thanks and said, Do this in commemoration of Me.”- (I Apology 66. 3)
“And on the day which is called Sunday, there is an assembly in the same place of all who live in cities or in country districts, and the records of the Apostles…are read as long as there is time.” –(I Apology 67. 3)
For this to happen, there would have to have been many copys of the texts for the different communities. (This Justin Martyr example proves the greek speaking Christians at least had them)
On July 17, 180 AD Proconsul Saturninus of Numidia held a trial and celebrated 12 martyrs from the tiny town of Scillium ordered that the scriptures written in Latin should be burned. This shows that the texts were widely diffused to this area and that Christians were instructed by scriptures, otherwise why else would he have ordered them burned?
As you pointed out, a fragment of the Gospel of John was found in Egypt that dates 140-150AD. The fact that even a piece of the Gospel of John was found in Egypt so soon suggests how rapidly the Gospels were diffused.
Apostolic Fathers from 70-155 AD were well acquainted with scriptures. St. Ignatius of Antioch (died circa 107AD), Clement of Rome, St. Polycarp of Smyrna (died 155/166AD). The Didache (70-100AD) contained around 30 quotations or references from the Gospels.
Given the fact that we have thousands of quotations of the New Testament in the 2nd century, Tatian’s Diatesseron, rapid diffusal of the Gospels at early dates, and many quotations from the apostolic fathers and the Didache, it’s fairly certain that we know that the original Gospels are essentially the same as the Gospels we have today.
I don’t mean to de-rail the original intentions of the thread, please continue discussing the early time line of the Catholic Church