Your Mouth Has a Life of Its Own—and Scientists Just Discovered Something More (James 3:6)

We sometimes say that our mouth has a life of its own. Usually, we mean that something came out before we had time to stop it. We spoke in anger, repeated something we should not have repeated, or made a remark we immediately regretted.

But a recent scientific discovery gives that expression another meaning. In 2024, researchers reported finding a previously unknown class of RNA elements in the human microbiome. They named them Obelisks because their RNA appears to fold into a long, rod-like shape. Each Obelisk is only about 1,000 nucleotides long. Yet researchers could not match them to any known virus, viroid, or other biological agent.

After searching databases from around the world, they identified nearly 30,000 different Obelisk sequences. In the original study, Obelisks were detected in 17 of 32 oral microbiome samples. They were also found in approximately 7 percent of the stool samples examined. At least one type of Obelisk appears to live within certain strains of Streptococcus sanguinis, a bacterium commonly found in the mouth. Obelisks also contain instructions for making a previously unknown family of proteins. The researchers named these proteins Oblins.

But scientists still do not know what Obelisks do. They do not know whether they help or harm the bacteria that contain them. They do not know whether they affect human health. They do not even know whether Obelisks should be considered alive. They know they are there. They just do not know what they are doing. Something had apparently been present in our mouths for a very long time, but we had never recognized it. The mouth really does have a life of its own.

But this discovery made me think about something else associated with the mouth—something James warned us about nearly 2,000 years ago.

The tongue.

And the tongue is a fire, a world of unrighteousness. The tongue is set among our members, staining the whole body.
James 3:6 (ESV)

The tongue is small, but its effects can be enormous. A few words can encourage someone who is ready to give up. They can also humiliate someone we claim to love. A careless remark may take only seconds to speak, but the person who heard it may remember it for years. A rumor can travel through a family, a workplace, or a church before anyone stops to ask whether it is true. That is why James compares the tongue to a fire. A small flame can spread far beyond the place where it began.

James also writes:

But no human being can tame the tongue. It is a restless evil, full of deadly poison.
James 3:8 (ESV)

“Restless” is an interesting word. James describes the tongue almost as if it has a life of its own. That is often how we excuse it. “It just slipped out.” “I was angry.” “I didn’t really mean it.” But Jesus would not allow us to blame our mouths as though they were acting independently.

For out of the abundance of the heart the mouth speaks.
Matthew 12:34 (ESV)

The mouth does not create what is inside us. It reveals it. If I have been holding on to anger, eventually anger will speak. If I have been feeding resentment, resentment will find its voice. If my heart is filled with gratitude and grace, those things will also come out. Controlling the tongue, therefore, is not simply a matter of choosing better words. We must also ask what has been growing in our hearts.

Scientists may spend years trying to understand what Obelisks are doing inside the human mouth. Perhaps they will eventually discover that they help their bacterial hosts. Perhaps they cause harm. Perhaps their presence has no meaningful effect on us at all. For now, we do not know.

But we already know what the tongue can do. It can comfort or condemn. It can tell the truth or spread a lie. It can reconcile people or divide them. It can praise God and then injure someone made in His image.

Scientists have discovered something unfamiliar hiding inside our mouths. James asks us to consider something much more familiar coming out of them. The question is not only, “What is living in my mouth?” It is also, “What has been living in my heart—and what happens when I allow it to speak?”

Love and trust the Lord; seek His will in your life.

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