Pilate asked, "What is truth?" Jesus gave no response. In most usual cases, such a response is warranted to such a retorical questions. In this case however, Pilate had no idea. Even had he posed the question as, "Who is truth?" he probably still would not have received an answer. At that point, if Pilate did not know any better, then he was doomed anyway.
Paul posed a similar exchange in Galatians 4:9, "But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?" He refers here to the law and the flesh. John amplifies this in 1 John 2:4, "He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him."
The world says, "It's not what you know but who you know." Beware lest Jesus one day say to you, "I know you not whence ye are: Then shall ye begin to say, We have eaten and drunk in thy presence, and thou hast taught in our streets. But he shall say, I tell you, I know you not whence ye are; depart from me, all ye workers of iniquity. There shall be weeping and gnashing of teeth...." (Luke 13:25-28)