Nina Conti Ventriloquist

What does it mean to be controlled by the Spirit?  Romans 8:9 says,"But you are not controlled by your sinful nature. You are controlled by the Spirit if you have the Spirit of God living in you. (And remember that those who do not have the Spirit of Christ living in them do not belong to him at all.)"How does one let God speak through you?  1 Peter 4:11 says, "If anyone speaks, they should do so as one who speaks the very words of God."