Nothing changes a ministry so much as a Sovereign Act of God, whether it is a revival, a miracle or a voice from heaven. Such experiences affect the person greatly. For instance, this one was an affirmation of Isaiah's life and ministry. It is one thing to prophesy about matters which rise up in one's spirit, while it is another to receive direct words from heaven in the person of the Living God. Throughout history these kinds of events have been both rare and treasured, and they offer several dynamics we can glean from them.