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. CarsonIn any Christian view of life, self-fulfillment must never be permitted to become the controlling issue. The issue is service, the service of real people. The question is, 'How can I be most useful?', not, 'How can I feel most useful?'
D. A. CarsonThe important thing, Jesus is saying (in Matthew 5:33-37), is to tell the truth and keep one's pledges without insisting that a certain form of words must be used if it is to be binding. No oath is necessary for the truthful person... Their word is so reliable that nothing more than a statement is needed from them.
D. A. CarsonGod's love in John 3:16 is not amazing because the world is so big, but because the world is so bad.
D. A. Carson