This view confuses usefulness with verity. Think of a person who chronically mismanages his money and is very unsuccessful. He comes into a few hundred dollars that are stolen from him without his knowledge. After this, he becomes successful through hard work and diligence. Yet his belief that he lost the money, however beneficial, is not a true because it does not conform to reality.
Truth is what corresponds to reality.
When this is established, we can move on to considering what particular statements are true. Unlike Pilate, we can stay and listen to what Jesus has to say to us. If you'd like to study this issue further, take a look at one or more of the following books. They each help answer the question of what is truth. Online Christian Resources.