In the 8th century BC, God's people were lost in luxury, laziness and complacency. So, God spoke through Amos. The Lord would roar from heaven at injustice and unbelief and call on his people to let true justice roll on like a river. Living in a world still full of prosperity and injustice, Amos's book stands as a warning , but it also encourages us that the God who roars will also rebuild.