The answer is: Oaths

Matt 5:36

In Matthew 5:36, when Jesus tosses out the idea of changing hair color, he's getting to the heart of simple honesty. In those days, people often swore oaths to prove their sincerity, even upping the ante by swearing by something greater—like heaven or their own heads. Essentially, it indicates the absurdity in thinking you could put as much trust in colorful hair as you could in oaths. By saying you can’t add a single hair color change, he practically dares us to reconsider our habits of trying to manipulate the truth just by the words we use.

Isn't it fascinating that from a biological standpoint, human hair is the result of genetics and a dash of well-timed beauty heritage - things we simply can't control, much like honesty should flow naturally from ourselves. Jesus is saying, “Encode your words with a kind of raw integrity that doesn’t require an oath.” Besides, in his time, oaths were often tragic misadventures taken too lightly.

Interesting trivia: Apparently, Egyptians had their own maxims about hair, believing one's hair could affect their destiny. Jesus contrasts that by simplifying complexities, inviting us toward a society where reliance on honesty replaces fear of welfare-driven swearing. Now, transition from tangled lies to pure golden truths is a charm! Each choice ends up reflecting a truth much deeper than surface reliability, inviting all of us to embody integrity effortlessly.