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Malcom Muggeridge famously observed that “the depravity of man is at once the most empirically verifiable reality but at the same time the most intellectually resisted fact.” On the face of it, this observation rings true. And yet, we often hear expressions of absolute disgust at humanity alongside affirmations that “he’s basically a good person.” Why do we resist what seems so self-evident?

The roots of our resistance emerge from our hearts. References to the “heart” are replete in Scripture, because it is the Holy Spirit’s way of referencing our whole being or person. We see this even in our common manner of speaking. For example, when we talk about a person’s truly appropriating an idea or practice, we say, “She really took it to heart.” That is, it became a part of who she is through her regular thought and practice. When the Bible wants to address who we are as human beings, it speaks of the heart.

It’s quite a jolt, then, when we read in Jeremiah 17:9 that the human heart is “deceitful above all things” and, in the King James Version, “desperately wicked” (ESV “desperately sick”). If this is said of the heart, according to a biblical anthropology it must be said of human nature. Human nature, in its natural state, is “desperately wicked” or depraved. And the reason that humanity is unwilling to admit this is because our wicked hearts are “deceitful above all things.” We are in double trouble: we are sick and unwilling to admit it, which means we will never look for a cure on our own.

But, we might think, maybe this is just an Old Testament thing. Maybe this is Jeremiah doing his “jeremiad” thing. Maybe this is a judgment given when Israel was in a really bad place, and things got better with time.

If there is going to be any lasting spiritual remedy for humanity, it must address the root problem—our desperately wicked hearts.

The problem with these suggestions is Jesus’ own teaching. In Mark 7, He makes a point of highlighting what defiles a person. Much like the fascination many today have with “self-care” through eating the right foods and engaging in healthy practices, the Pharisees and scribes of Jesus’ day established traditions such as the proper washing of hands, pots, and even couches. However, for many Pharisees, these went beyond “self-care” to having a role in securing one’s righteousness before God (vv. 1–13). This approach presumes that the basic human problem comes from the outside. Jesus teaches the exact opposite:

“Hear me, all of you, and understand: There is nothing outside a person that by going into him can defile him, but the things that come out of a person are what defile him.” And when [Jesus] had entered the house and left the people, his disciples asked him about the parable. And he said to them, “Then are you also without understanding? Do you not see that whatever goes into a person from outside cannot defile him, since it enters not his heart but his stomach, and is expelled?” (Thus he declared all foods clean.) And he said, “What comes out of a person is what defiles him. For from within, out of the heart of man, come evil thoughts, sexual immorality, theft, murder, adultery, coveting, wickedness, deceit, sensuality, envy, slander, pride, foolishness. All these evil things come from within, and they defile a person.” (Mark 7:14–23)

In teaching against a twisted understanding of humanity, Jesus makes precisely Jeremiah’s point: the human heart is the enduring problem. The human heart is what makes men and women wicked and causes them to do wicked things. Thus, if there is going to be any lasting spiritual remedy for humanity, it must address the root problem—our desperately wicked hearts. And that is exactly what Scripture teaches: true religion starts in the heart.

King David is the great biblical figure of the heart. He is commended to the people of God because he was a man after God’s “own heart” (1 Sam. 13:14). And he pursued God because his own heart had been touched by God’s grace. Perhaps the greatest testimony to this is what David did when convicted of sin. After finally seeing his sins against Bathsheba and Uriah for what they were, he petitioned God in Psalm 51 for a clean heart.

A heart apart from God’s grace is desperately wicked but doesn’t know it. A heart touched by God’s grace might still slip into wickedness, yes, but it will knowingly turn in repentance and faith in God and find cleansing in His grace.

If David’s prayer of repentance reminds us that the cleansing of our hearts comes through a source outside us, the writer to the Hebrews points us to the specific source of that cleansing: “Let us draw near with a true heart in full assurance of faith, with our hearts sprinkled clean” by the blood of Christ (Heb. 10:22–23). The cleansing of our desperately wicked hearts comes through an application of the blood of Christ shed once and for all on the cross. Once cleansed, though, where does a Christian heart go?

The Christian’s heart, is strengthened through the Word of God. Later in Hebrews, when the writer is encouraging good teaching and warning against strange teaching, he says, “It is good for the heart to be strengthened by grace” (13:9). He makes clear the content of that grace is Jesus Christ, who “is the same yesterday and today and forever” (v. 8).

Scripture never says a cleansed heart cannot sin. Just look at David. But unlike a wicked heart that doesn’t know its own sickness, the heart cleansed by the blood of Christ knows it needs to—and wants to—grow in the grace of Christ. The Christian knows there are no inherent resources for this growth but only comes as we receive good teaching from the Word of God and the Spirit writes that very Word on our hearts (Heb. 8:10).

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