Sermon: Joel: The Great and Awesome Day of the Lord. The book of Joel is a little book with a great message. The prophet Joel lived in a time of national catastrophe, and in his prophecy he instructed the nation Israel about how to respond in times of national crisis. After the Orlando Massacre, the book of Joel finds fresh relevance for Americans today. How should we respond in times of national tragedy? Listen to this sermon to hear what the Word of God says about the Day of the Lord and what it means for us in light of the terrible things that happen in our world.