"Is not the commission of our Lord still binding upon us? Can we not do more than now we are doing?"

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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. Carson