Acts
One could always argue that a ghost writer helped the Apostle to compose the Gospel of John. Or that the Apostle schooled himself in Greek as he grew older.
He may have been personally schooled in the doctrine Jesus taught, but that doesn’t answer where he learned to write good Greek.
Another curiosity about the disciple John is found in the Gospel of Mark. John, along with two other disciples, was a privileged witness when Jesus raised Jairus’ daughter from death
Mark
But the story was left out of the Gospel of John although the disciple John was supposed to have been there when it happened.
The Gospel of Mark informs us that John was an eyewitness to the transfiguration of Jesus, too, when Jesus met with Moses and Elias on a mountain
Mark 9:2 Six days later Jesus took with him Peter, James, and John, and led them up a high mountain, where they were alone. As they looked on, a change came over Jesus, 3 and his clothes became shining white--whiter than anyone in the world could wash them.
But strangely, the Gospel of John fails to mention the miracle even though the disciple John was supposed to have been there.
The Gospel of John fails to give an account of the ascension of Jesus, too--it was a central event. John and other followers of Jesus were supposed to have been witnesses to Jesus' levitation to heaven. But only Luke reports it and he wasn't an eye-witness to it
Luke 24:33 The two followers of Jesus got up at once and went back to
John
The text doesn’t give “the disciple” a name. It just says it’s “he.” So it’s a mystery who “he” was supposed to be.
Further, it's ambiguous who the “we” were supposed to be, where the text reads “we know that what he said is true.” I ask how the “we” group knew what he said was true.
Recap: The author of the Gospel of John remains a mystery.
Related post:
42 Did the Gospels come from eyewitnesses