Is the Christian’s Heart Deceitfully Wicked?

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By John Piper About Sanctification & Growth
Part of the series Ask Pastor John

Audio Transcript

Is the Christian’s heart deceitfully wicked? You’ve heard that “deceitfully wicked” phrase from the Old Testament, but is such an indictment applicable to the regenerated Christian heart? The question is from a podcast listener named Micah. “Pastor John, hello! I was recently in a debate with a friend over Jeremiah 17:9: ‘The heart is deceitful above all things, and desperately sick; who can understand it?’ I applied it to the ongoing sin-blindness in the heart of the Christian. My friend said I was taking a passage about unbelieving hearts and misapplying it to the Christian heart. However, in returning to the bigger context of Jeremiah 17:5–13, I find myself even more convinced verse 9 is equally applicable to believers, especially in light of verses 7 and 8. What do you think? Is Jeremiah 17:9 about believers, unbelievers, or both?” Pastor John, how do you process this text and its context?

Let me walk quickly through the flow of thought from Jeremiah 17:1–9. And I think everybody will be able to see how verse 9 is functioning.

Blessing and a Curse

Jeremiah begins with an indictment of Judah and a warning of destruction. It says, “The sin of Judah is . . . engraved on the tablet of their heart . . . while their children remember their altars and their Asherim” (Jeremiah 17:1–2). Those are other gods. Idolatry is the issue here. “Your wealth and all your treasures I will give for spoil as the price of your high places for sin” (Jeremiah 17:3). So, he’s going to bring judgment on them for the sin of their heart and the idolatry of their worship.

And then he says what’s beneath that. God says in Jeremiah 17:5–6, “Cursed is the man who trusts in man and makes flesh his strength, whose heart turns away from the Lord. He is like a shrub in the desert, and shall not see any good come.” That’s the root problem of the idolatry and the sin. The root problem is that they are trusting in man, not in God.

And then he describes what alternatively ought to be: the opposite of this and the benefits that would come if it were the case. “Blessed is the man” — not cursed is the man who trusts in man — “who trusts in the Lord, whose trust is the Lord. He is like a tree planted by water, that sends out its roots by the stream, and does not fear when heat comes, for its leaves remain green, and is not anxious in the year of drought, for it does not cease to bear fruit” (Jeremiah 17:7–8).

Every Heart an Idol Factory

Now, that leaves us with this question: If trusting in self results in such misery (no good shall come) and trusting in God results in such fruitfulness (you’re going to prosper), why in the world is a whole nation acting so suicidally in self-trust and sin and idolatry? And his answer is verse 9: “The heart is deceitful above all things, and desperately sick; who can understand it?” So, the human heart is diseased with sin and in the sway of deceit. And that’s why people act suicidally in preferring self-trust over God-trust.

So, the overall point of the passage seems to be that the root of sin and idolatry is a failure to trust in God rather than self. And the root of that failure is a deceitful and depraved heart. So, I think Jeremiah — indeed, I think all the biblical writers — would say that’s the root problem ever since the fall of man into sin and corruption. All human beings — no exceptions — are born with this kind of fallen, diseased, deceived, self-exalting, God-opposing heart.

What Happens in the New Birth?

So, the question is this: When a person experiences the new birth — becomes a Christian — what happens to that diseased, deceived, self-exalting, God-opposing heart? Here are some verses that describe what happens:

Divine DNA Infused

So, my conclusion is that we can say that Jeremiah 17:9 (the heart is deceitful above all things and desperately sick) is true of the human heart — all of them. But where God is applying the blood-bought purchase of the new covenant, there is a new creation. Sins are forgiven. Holy Spirit is poured in. New nature is brought into being. That newness consists in the presence of the heart-influencing Holy Spirit and in the new nature. You might call it the divine-like DNA that is more and more being conformed to Christ.

A good verse to end on would be 2 Corinthians 3:18: “Beholding the glory of the Lord, [we] are being” — this old, horrible, self-exalting, God-opposing heart of mine is being — “transformed into the same image from one degree of glory to another.”

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