This song means that he is going to tell the world about god, like the radio tells the news to the world. That you could have done things that you were not proud of in your past, and god will make you clean he will take it all away and restore you to tell the world of his glory. God can quench any thirst, heal any wound and fill you so you can spread his word and proclaim his glory, This song defines what he wants us to do with our lives not do drugs, not drink alcohol not fill your heart with relationships he is the one and only one who can fill you.