'Prophecy's main service,' says Parkyns, 'is to demonstrate God's hand in history. He demonstrates how prophecy how people can miss fulfillment by always looking to the future, case in point being the Jews still looking for their Messiah. Parkyns wonderfully shows the old testament to new testament "mapping" in Revelation chapter 4 and chapter 5, expounding on three exciting shifts that have taken place in heaven.