The 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. CarsonFor example, the Bible does say this is a proposition, "There is no God." But of course the context of Psalm 14:1 enriches it a bit: "the fool has said in his heart, there is no God." So there are contextual constraints and when you finish putting in all the contextual constraints and sophisticated discussions of what inerrancy is and isn't.
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. CarsonIf it is hard to accept a rebuke, even a private one, it is harder still to administer one in loving humility.
D. A. Carson