Jeremiah 17:9 Meaning: If Our Hearts Deceive Us, Who Can Know Them?

The Hebrew word behind “deceitful” is aqob, related to the name Jacob, the one who grasped his brother’s heel and later deceived his father. It carries the sense of being twisted, crooked, always working an angle. Your heart is not merely mistaken; it is actively supplanting, turning every situation to its own advantage. The second word, anush, is even more sobering. It does not mean “wicked” in the ordinary sense. It means sick, weak, beyond human remedy. The translators reach for words like “incurable” or “desperately sick.” This is not a heart that needs self-improvement; it needs a kind of healing only God can provide. And then the final word: yada, the Hebrew verb for knowing that is intimate and thorough. It is the same word used for a husband knowing his wife, or God knowing His people in covenant. Jeremiah asks: who can yada the heart? Not you, not your neighbor. Only the one who searches the mind and tries the heart. The diagnosis is severe, but it clears the way for the Physician.

Christians across traditions have read this verse with a shared sobriety. Reformation writers like Calvin and the Geneva Notes saw it as a rebuke to human self-reliance, especially in matters of salvation, the heart’s deceit is so deep that only God’s decisive grace can reach it. Wesleyan commentators like Adam Clarke emphasize that the heart hides even from itself, making honest self-examination impossible without divine light. More recent Anglican scholars, such as the Cambridge Bible editors, point out that this verse serves as a confession the prophet himself makes before God. In each reading, the question “who can know it?” is not left hanging; it finds its answer in verse ten, where God declares, “I, Yahweh, search the mind.” Across traditions, the point is that we dare not trust our own hearts, but we can trust the one who knows them.

A common mistake is to read this verse as a command to stop examining your own heart altogether, to give up on self-awareness because the heart is too deceitful to bother with. In fact, the verse is meant to drive us toward greater honesty, not away from it. The question “who can know it?” is rhetorical, but the implied answer is: God can. And since God invites us to bring our hearts to Him, we do not abandon self-examination; we learn to do it in His light, asking Him to show us what we cannot see. The cure for deceit is not ignorance but the search of the One who sees clearly.

Here is one place to start this week. Before you defend your position in an argument, before you rationalize a small compromise, before you assume your motives are pure, stop. Say quietly to God: I know my heart can trick me. Show me what I am missing. This verse asks us to hold our own confidence loosely. It asks us to be suspicious of our own excuses, especially the comfortable ones. And it frees us from the impossible burden of perfectly knowing ourselves. We do not have to. He does. So when you feel sure you are right about something, or sure you are innocent, or sure you have no hidden anger, pause and hand that certainty to God. He can handle it. He can also correct it.