Let Your Yes Be Yes: The Weight of Our Words

For the context, some say this is the coherence between the former matter and the present verse: men in affliction are usually impatient, and impatiency bewrayeth itself by oaths and curses,—a conceit very injudicious, and no way complying with the intent of the apostle
1. Embrace Simple Speech
What Christ is forbidding here is the flippant, profane, or careless use of oaths in everyday speech. In that culture, such oaths were often employed for deceptive purposes. To make the person being victimized believe the truth was being told, the Jews would swear by “heaven,” “earth,” “Jerusalem,” or their own “heads” (vv. 34–36), not by God, hoping to avoid divine judgment for their lie. But it all was in God’s creation, so it drew Him in and produced guilt before Him, exactly as if the oath were made in His name. Jesus suggested that all our speech should be as if we were under an oath to tell the truth (v. 37
2. Avoid Empty Oaths
our truthfulness should be so consistent and dependable that we need no oath to support it—a simple “yes” or “no” should suffice
