The X-Files taught us that the truth is out there. The elder, on the other hand teaches us that the truth is all in here—his letters, that is.
The elder has a very specific version of the truth, and there's no room for argument with him. According to this guy, the truth about Jesus was handed down to their community in the Gospel of John and that's it.
End of story.
Questions About Truth
Could the elder and his opponents both possess a valid truth about God?
Is there only one truth? Or is truth relative and constantly changing?
How does the elder come by the truth? From the gospel stories? From God himself?
How can believers figure out what the truth about God is? Yeah, this is a tough one.