The Kingdom of heaven is a mystery. Unfortunately we usually take the word "mystery" in a very commonplace sense, "something difficult or even impossible to understand" but this prevents us from entering into the great spiritual world of God's attraction, an attraction which became incarnate in Jesus. The parables are a reminder that part of Jesus' attractiveness was manifest in his ability to put the attraction and challenge of divine truth in an accessible and memorable form. It has been wisely observed that we cannot really explain Jesus' parables: it is the parables which explain us, our desires and inclinations our yearning for what is beyond us. St Augustine's phrase is quoted endlessly - "You have made us for yourself, O Lord and our hearts are restless till they rest in you." This restlessness is a very deep part of our human experience. Finding the treasure in the field does not end with the great joy of finding it: the desire to possess the treasure and so to make great sacrifices till his restlessness to possess the treasure ceases in the possession itself.