If listening means trusting yourself to this is true. But if listening means assuming that God would never speak through a person that was not listening or following Him, then that is not always true. God has on occasion used non-Christians to speak to me. And why not? He could speak through an ass and through Balaam right? What about Nebuchadnezzar or Cyrus? Both of them said and wrote things that are in Scripture. Don’t think there are certain people that God will never use to speak through.