I guess I always question the depth of someone's theology if they can put it on a bumper sticker. Back then it seemed that everybody was questioning authority. Today it seems that everybody is looking for authority. Religious people love to argue their respective points of view and build a strong case by quoting their authorities.
Some people quote experts in the field, perhaps famous preachers or scholars.
Others prefer to quote Scriptural passages that seem to back up their point of view. This question of authority comes up in the passage from Mark today. In fact, Mark refers to the authority of Jesus at the beginning and the end of our passage, kind of like the two pieces of bread on a sandwich with the story of an exorcism in between. The people are held spellbound because he spoke with authority, not like the scribes. A man comes before Jesus who is in the power of evil.