Authority can mean different things to different people. For example, some document or other may be authoritative for particular group even though it's not reliable. It's just that the group has accepted that document as authoritative for their group. And some documents are truthful and reliable but they are ignored, so they have no authority for that particular group.
D. A. CarsonJesus is hungry but feeds others; He grows weary but offers others rest; He is the King Messiah but pays tribute; He is called the devil but casts out demons; He dies the death of a sinner but comes to save His people from their sins; He is sold for thirty pieces of silver but gives His life a ransom for many; He will not turn stones to bread for Himself but gives His own body as bread for people.
D. A. Carson