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. CarsonEffectiveness in teaching the Bible is purchased at the price of much study, some of it lonely, all of it tiring.
D. A. CarsonGod has disclosed of himself in human words with such magnificent self accommodation to our limitations. Precisely so that we may be his holy people and reverence everything that he says, cherish it, value it, and thus live it out.
D. A. Carson