What did Pilate mean by asking "What is truth?"

When Jesus is brought before Pilate, he asks him if he is a king. When Jesus admits that he is Pilate says > “You are a king, then!” said Pilate. > > Jesus answered, “You say that I am a king. In fact, the reason I was born and came into the world is to testify to the truth. Everyone on the side of truth listens to me.” > > “**What is truth?**” retorted Pilate. With this he went out again to the Jews gathered there and said, “I find no basis for a charge against him. *(John 18:37-38)* Does Pilate actually believe Jesus, or is he simply being dismissive of Jesus' "naivite" in assuming there is such a thing as truth? I'd like answers that pull from the tradition of mainstream Christian factions and scripture.