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There are none. There are some things hard to understand and especially many deep spiritual truths, but no contradictions. Since John, like the rest of scripture is divinely inspired, God knew what He wanted written through the mind and pen of John. He did not forget as He went nor did He contradict what He said previously in other places.
Luke says that Heli was the father of Joseph (Luke 3:23).
New Testament scholars accept that at least one, and probably both, evangelists had to be in error at this point.
Luke says that Neri was the father of Salathiel.
Luke goes back through a line of commoners to Nathan and then David.
Luke inserts Admin as the father Aminadab, and so Aram is the grandfather of Aminadab.
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Most of the non-canonical gospels were gnostic, even if only mildly so, compared to the synoptic gospels (Matthew, Markand Luke). Actually John's Gospel is thought to be mildly gnostic and was probably more so before being accepted into the centrist Church in the second century, when some material appears to have been altered.
An almost universal attribute of gnostic gospels is the theme that Jesus did not suffer on the cross, as he either escaped physical pain or was replaced by a surrogate such as Simeon of Cyrene. In John's Gospel we see a little of this. In Marks Gospel, Jesus prayed for three hours in the Garden of Gethsemene, his soul sorrowful unto death, praying that his destiny be taken from him, whereas John has Jesus praying almost cheerfully before going to the garden, then arrested almost as soon as he arrives in the garden. Mark has Jesus on the cross for six hours, then let out a great cry and his last words, "My God, my God, why hast thou forsaken me?" For John the crucifixion was mercifully short (less than three hours), with Jesus in full control, he did not cry out and his last words were more dignified, "It is finished." This is an almost 'centrist' account compared with most of the non-canonical gospels.
Thomas is known as a Sayings Gospel, because it contains only sayings attributed to Jesus, with no narrative and no crucifixion reference. John Dominic Crossan (The Birth of Christianity) makes the case that there was an original Common Sayings Tradition that contained neither Gnosticism nor apocalypticism, and that this was the source for Thomas, which turned the emphasis towards Gnosticosm, and for the 'Q' Gospel, which turned the emphasis of that tradition towards apocalypticism. The hypothetical 'Q' Gospel was the second major source used for Matthew and Luke.
Many of the gospels were rejected not so much because of direct contradictions with those accepted into the New Testament, but because of material not even found in Matthew, Mark, Lukeand John. They contain theology that was never accepted into the centrist Church.
There are many contradictions between John's Gospel and the synoptic gospels, although fewer within the gospel itself. For an example of a contradiction between John and the other gospels, just look at the story of the empty tomb:
Actually all 12 were there.
Johns Varghese has written: 'The imagery of love in the Gospel of John' -- subject(s): Bible, Commentaries, Love, Biblical teaching
List three ways johns gospel Differs from the synoptic gospels
Why are there contradictions in the biblical narratives?
John--the beloved disciple--had a tough life after Jesus. He was captured by the Romans and sent to the Island of Patmos.
These were two different Johns, attributed to two different books.
Resolving Contradictions was created in 1978-03.
Contradictions Collapse was created on 1991-10-01.
Contradictions - album - was created on 1999-11-09.
John was the most beloved disciple. Like the rest of the disciples, he was commissioned to preach the gospel and to heal the sick. John also received the revelation of the end days.
There are a number of contradictions, but most of these can be harmonised.For instance, in Matthew, Jesus' last words are "my god, my god, why have you forsaken me?". In Luke, they are "Father, into your hands I commend my spirit". In John, they are "It is finished."People defending biblical innerancy argue that Jesus actually said all of these things, but each gospel writer ignored the bits that the other gospel writers caught. It is likely that things like the above are contradictions and sometimes the gospels can be wrong, but in terms of Aristotolean logic, these are not strictly "contradictions"There are some other cases when the bible does contradict itself directly, but these are less common. For instance, in the synoptic gospels, Jesus dies after the first day of passover. In John's gospel, he dies on the day of preparation for the passover. All contemporary scholars accept that John is not correct, but has claimed that date to draw parallels between Jesus and the sacrificing of a passover lamb.
A mass of contradictions would be wheere there are many things or thoughts that go against each other.