Out of the abundance of the heart the mouth speaketh. — Matthew 12:34b
Scripture is clear about the connection between the heart and the mouth. Out of the abundance of the heart the mouth speaketh. Jesus said it plainly and without qualification. The mouth is not the source of what we say. It is simply the outlet. What fills the heart will eventually find its way out, not always in the polished moments when we are choosing our words carefully, but in the unguarded ones. The heat of the moment when we have been pushed to our limits. The private conversation when we believe no one important is listening. The tired, frustrated, off-guard moment when the filter we normally maintain simply gives way.
In those moments, our true character shows. And what is in our hearts comes out. The Pharisees that Jesus addressed in Matthew 12 were skilled at the public version of their words. They knew the right language. They used the right religious vocabulary. They said what sounded correct in settings where correctness was expected. But Jesus saw through the performance to what drove it. And He named it directly. Their words, however polished on the surface, were revealing hearts that were not what they appeared.
Peter is the more honest example. On the night Jesus was arrested, Peter followed at a distance and found his way into the courtyard where they held Jesus. He was not trying to be identified as a disciple. He was trying to stay hidden in the crowd. But when a servant girl approached him and suggested he had been with Jesus, something gave him away before he could fully control it. Later, others nearby confirmed it with words that have always stayed with me. Surely thou also art one of them, for thy speech betrayeth thee.
His speech betrayed him. Not his theology. Not his public declarations. The way he used words. The manner of his expression. Something about how he spoke had been shaped by his time with Jesus in ways he could not fully disguise even when he was trying. His words were evidence of where he had been, even in a moment when he was desperately trying to deny it.
That cuts in both directions. There are moments when our words betray us in ways we would rather they didn’t, when what comes out in the heat of the moment or in a private conversation reveals something about the condition of our hearts that the public version of ourselves has been carefully concealing. Those moments are uncomfortable. But they are honest. They show us where we actually are rather than where we have been pretending to be.
And there are moments when our words betray us in the best possible way. When something comes out that is gentler than the situation required, more gracious than the person deserved, more full of faith than our circumstances seem to justify. Moments when someone notices that we spoke differently than they expected, and something in what we said pointed somewhere beyond ourselves.
Both kinds of betrayal are evidence. Both tell a story about what has been filling the heart. The question worth pondering is not what we say when we are paying attention. Most of us can manage that. The question is what comes out when we are not. When the pressure is on, and the filter is down, and the private moment arrives, whatever is actually inside us finds its way to the surface.
What do your words argue for when no one important is watching? That is the evidence the heart produces. And it is telling the truth about where you have been. Your words are evidence. Not the careful public ones. The unguarded private ones. What are they arguing for?
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