Original Document Written by Christ Jesus
There are still some mysteries about the Gospels:
Why do they all look similar to one another in their contents about deeds and words as well as episodes of Christ Jesus' preaching?
Why were they written in Greek but not in Aramaic or Hebrew?
Why were they written more than three decades after the Crucifixion of Christ Jesus?
Why were they chosen as canonical books for the Bible?
And why do they include some criticism against Peter and other Apostles?
My theory is that there was one authentic original document written in Hebrew or Aramaic describing the activities of Christ Jesus. All the four Gospels were actually translation from this original document. Because the original document about Christ Jesus was written by somebody closer to Him, it was recognized as authentic. It was translated because there arose some needs to present the conditions of the preaching by Christ Jesus to some Romans or the Roman authority who mostly read Greek documents. Probably the need is to defend Paul in the trail in Rome.
Before the translation, this original document had been kept secret by the Apostles or direct followers of Christ Jesus who mostly lived around Jerusalem after the Crucifixion of Christ Jesus. So, since the Gospels were all based on this authentic document, the Gospels were later naturally regarded as authentic by leaders of early Christians. The leaders of early Christians had to accept all the Gospels because they were all written through translation by authors or translators who were close to Paul or Peter.
But why didn't the Apostles and direct followers of Christ Jesus who knew the existence of the original document make it public? It must have been not only to keep their superior status based on the fact that only they had really seen and heard Christ Jesus preaching but also a fear to openly show the contents against Judaism and criticism even against Peter and other Apostles. And this point that the earliest translation Mark clearly presented Christ Jesus' criticism against Peter and other Apostles suggests who wrote this original document. Who, except Christ Jesus, could criticize Peter and other Apostles?
That is why I think that the Gospels were based on, or a kind of translation of, an original Hebrew/Aramaic document written by Christ Jesus Himself.
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Joh 5:19 Then answered Jesus and said unto them, Verily, verily, I say unto you, The Son can do nothing of himself, but what he seeth the Father do: for what things soever he doeth, these also doeth the Son likewise.