" WHAT IS TRUTH" re Pilate to Jesus.
What a brilliantt observation to that question " Ruby"
You assume in your question both were " talking about a kind of ethics to live by" so let's take your " two cultures" statement further. Jesus was a carpenter, Pilate lived in a clean, splendid palace, and had servants to clean. But both once had mummy to clean the diapers. One of these men a carpenter had become a " King" and this impressed Pilate who was born a " king"
So let's speculate. Maybe by Pilates question " What is truth?" he was asking " What makes a great man?" and Jesus reply " I have come to bear witness to the ( that ) truth" And Jesus answer which was a kind of insane rhetoric about self- reliance impressed Pilate...and he tried to " half heartedly" save Jesus, because he admired the man.
What I find interesting with Pilate, he obviously admired Jesus. I also believe, by raising the question if Pilate thought Jesus was anything more than a " man" he would have humbled himself and actually saved the " son of God". So my conclusion,Jesus never convinced Pilate he was anything other than a man, yet Pilates question was sincere.
The Rebel.