As we look at the hard sayings of Jesus, we see in this passage that Jesus gives us a radical principle of truthfulness. 
The whole Bible is built on covenants, public promises, observed words. So what does Jesus mean when he says to let your “yes” be “yes”? He can’t mean you can’t take oaths. What he does mean is actually something almost the opposite, that if you think you can separate and create levels of truthfulness, you’re wrong. Everything is observed. Every yes and every no is an oath. 
Jesus is teaching us 1) the importance of truthfulness, 2) the nature of truthfulness, and 3) how you become a person of integrity.
This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on February 14, 1993. Series: Hard Sayings of Jesus (1993). Scripture: Matthew 5:33-37.
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Released on 25 Aug 2023