In "Word Focus" Darrell Grim writes:
The Lord's reply to Pilate's question was deliberately ambiguous. Jesus spoke here as He spoke to the Jews — in parables. If they really wanted to find out the truth, they could, but their blinded eyes made His teaching seem as nonsense. Jesus gave Pilate enough to pique his curiosity. Had he continued to press with an earnest desire to know the truth, without doubt Christ would have revealed more to him.
Discussion: When God seems not to give us "straight" answers, do we continue to seek His word or are we content to be blind to Truth?
Source: Jesus, Son of God: Adult Teacher's Insights, page 78.