Jeremiah 17:9, ESV

Most of us have heard these words so many times we could finish the sentence before Jeremiah does. “The heart is deceitful above all things, and desperately sick; who can understand it?” (Jer. 17:9, ESV). It’s been preached so many times we almost don’t listen anymore. But here’s a fair question: do we actually understand what Jeremiah was saying?

At first glance, the easy takeaway is simply, “don’t trust your heart.” And that’s true as far as it goes. But it doesn’t go far enough, and Jeremiah’s context pushes us deeper.

The Hebrew word behind “deceitful” here is agob, and it carries a picture we might not expect. It means a hill or a swelling. In Jeremiah’s day this word appeared in connection with pride, the heart that puffs itself up and rises above what it should be. So when Jeremiah says the heart is deceitful, he’s not just warning us about little white lies we tell ourselves. He’s describing a heart that quietly swells with self-interest, one that tilts every decision in its own direction.

That swelling is what makes the heart dangerous. A heart focused inward will deceive us into something self-serving and dress it up to look like wisdom. We’ve all been there. Something draws us in and seems perfectly reasonable, maybe even good, right up until the moment we realize it was never really about God at all. It was about us.

Jesus said the same thing plainly in Matthew 15:18–19: “But what comes out of the mouth proceeds from the heart, and this defiles a person. For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false witness, slander.” The heart left to itself will pull us toward something that looks like light from the outside and leads somewhere darker than we expected.

So what do we do with a heart like that? We can’t fix it from the inside. You can’t straighten something with the very thing that’s bent.

The answer Jeremiah’s story points toward is the same one Paul described when he stood before King Agrippa and recounted his calling: to turn people “from darkness to light and from the power of Satan to God” (Acts 26:18, ESV). That kind of turning doesn’t come from willpower or a better morning routine. It comes from heart surgery, the kind only Christ can perform.

He and He alone can take a heart that swells with self-interest and replace it with something surrendered, something that runs toward God instead of away from Him. If that’s where you find yourself today — tired of the patterns you can’t seem to break, weary of a heart that keeps steering you wrong — bring it to Him. He’s not surprised by what He finds there. And He is more than capable of doing something about it.