As David makes his 2nd attempt to bring the Ark to Jerusalem, his approach is very different to the first time. His fresh awareness of God's holiness produces reverence. This time he proceeds with carefulness, sacrifice, and humility. He finds that a true awareness of God's moral brilliance and transcendence doesn't dampen or dilute his joy. Rather, it deepens it. The God who enters Jerusalem to dwell there is the holy, holy, holy God of Creation - who David can approach and dwell with, by means of sacrifice. This causes a volcano of joy to erupt in David's heart.