The Perfect Penitent

Today's Scripture

Today we stand at the center of the Christian faith: the cross. Read these slowly.

Mark 10:45 — "For even the Son of Man came not to be served but to serve, and to give his life as a ransom for many."

2 Corinthians 5:21 — "For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God."

Isaiah 53:6 — "All we like sheep have gone astray; we have turned — every one — to his own way; and the Lord has laid on him the iniquity of us all."

The Big Idea

Christianity's central claim is not advice but news: Christ died for our sins, and his death actually did something. Lewis's picture of how it works is striking — repentance is a kind of death that only a perfect person could perform, so God became man to perform it in us and for us.

Reflection

The formula comes before the theories

Lewis begins with refreshing honesty. Before any explanation, there is the thing itself:

"We are told that Christ was killed for us, that His death has washed out our sins, and that by dying He disabled death itself. That is the formula. That is Christianity. That is what has to be believed." — C.S. Lewis, Mere Christianity

Notice what Paul preaches in Luke 24:46-47, what the apostles preached everywhere: "Thus it is written, that the Christ should suffer and on the third day rise from the dead, and that repentance and forgiveness of sins should be proclaimed in his name to all nations." The event is the gospel. The explanations — theologians call them theories of the atonement — are the church's attempts to look into a mystery from different angles, the way you might walk around a great mountain.

And Lewis offers one of the most useful sentences ever written for people who feel they must understand everything first:

"A man can eat his dinner without understanding exactly how food nourishes him. A man can accept what Christ has done without knowing how it works: indeed, he certainly would not know how it works until he has accepted it." — C.S. Lewis, Mere Christianity

You did not pass a chemistry exam before breakfast this morning. You just ate, and the food did its work. The cross is like that. It feeds people who cannot fully explain it — which is all of us.

The trap: the worse you are, the less you can repent

Still, Lewis offers his own picture, and it is worth slowing down for. Start with what repentance actually is. The word sounds churchy, but it simply means turning around — laying down your arms, unlearning the self-centeredness we have been practicing since the nursery. Real repentance is not saying "my bad." It is a kind of death to the old way of being you.

And here Lewis spots the trap:

"Only a bad person needs to repent: only a good person can repent perfectly. The worse you are the more you need it and the less you can do it. The only person who could do it perfectly would be a perfect person — and he would not need it." — C.S. Lewis, Mere Christianity

You have felt this. The deeper a habit goes, the harder it is to turn from — the very selfishness you need to kill is the thing holding the knife. A drowning man cannot also be his own lifeguard. Isaiah 53:6 describes the whole human race in one line: "All we like sheep have gone astray; we have turned — every one — to his own way." Sheep do not find their own way home. That is the one thing sheep cannot do.

So we need to repent and cannot. God does not need to repent and can. The need and the ability are in two different places. What could possibly bring them together?

God in the water with us

Here is Lewis's answer — the reason Christmas exists:

"But supposing God became a man — suppose our human nature which can suffer and die was amalgamated with God's nature in one person — then that person could help us. He could surrender His will, and suffer and die, because He was man; and He could do it perfectly because He was God." — C.S. Lewis, Mere Christianity

The perfect penitent. Jesus walks the whole road of repentance — total surrender, suffering, death itself — not because he owed it, but so that it could be walked in our nature, perfectly, once for all. Hebrews 2:14-15 says he took flesh and blood precisely "that through death he might destroy the one who has the power of death... and deliver all those who through fear of death were subject to lifelong slavery." He got into the water with the drowning.

The old church fathers loved this picture. Athanasius, defending the deity of Christ seventeen centuries ago, put it in one daring sentence:

"For the Son of God became man so that we might become God." — Athanasius, On the Incarnation

He did not mean we become deities; he meant the divine life comes to live in us — that the Son entered our condition so we could be brought into his. And John Stott compressed the cross into the tightest summary you will ever read:

"The essence of sin is man substituting himself for God, while the essence of salvation is God substituting himself for man." — John Stott, The Cross of Christ

In Eden, we reached up to take God's place. At Calvary, God reached down to take ours. 2 Corinthians 5:21 says it without metaphor: "For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God." And 1 Peter 2:24: "He himself bore our sins in his body on the tree, that we might die to sin and live to righteousness."

Who pays — and why it is not unfair

At this point an honest objection usually surfaces, and Lewis faces it head-on. Isn't it unjust for an innocent person to suffer in place of the guilty? If a classmate cheats and the teacher punishes you instead, nothing about that feels like justice. Why is the cross any different?

Lewis's answer turns on who is doing the paying. The cross is not a third party being dragged in to absorb someone else's penalty. The offended one and the paying one are the same God:

"That is the sense in which He pays our debt, and suffers for us what He Himself need not suffer at all." — C.S. Lewis, Mere Christianity

Think of debt rather than detention, because that is the Bible's own picture. If you owe a crushing debt you cannot pay, and the very person you owe it to chooses to absorb the loss himself — tearing up the contract at his own expense — no one calls that unfair. We call it grace. Paul says that is precisely what happened: "And you, who were dead in your trespasses... God made alive together with him, having forgiven us all our trespasses, by canceling the record of debt that stood against us with its legal demands. This he set aside, nailing it to the cross" (Colossians 2:13-14). There was a real record. It really stood against us. And God did not shred it by pretending the debt never existed — he nailed it to the cross, where he paid it.

This is why Paul can make the strange double claim that God is both "just and the justifier of the one who has faith in Jesus" (Romans 3:26). Just — because the debt was actually paid, not waved away. Justifier — because he is the one who paid it. Mercy and justice meet at the same nail.

And notice what this does to the unfairness objection: it reverses it. The only "unfairness" in the gospel runs in our favor. The one being who never owed anything paid everything; the ones who owed everything are handed a receipt marked paid in full. If you insist on strict fairness, you are asking to keep your own debt.

What the cross tells you about you

Step back and let the two halves of this land on you at once, because the cross says two things about you simultaneously.

It says your condition was desperate. No effort, no resolution, no self-improvement plan could perform the turning you needed — it took the death of the Son of God. But it also says your worth to God is staggering: "God shows his love for us in that while we were still sinners, Christ died for us" (Romans 5:8). Not after we cleaned up. While. Tim Keller spent his ministry holding those two truths together:

"The gospel is this: We are more sinful and flawed in ourselves than we ever dared believe, yet at the very same time we are more loved and accepted in Jesus Christ than we ever dared hope." — Tim Keller, The Meaning of Marriage

That is why the gospel humbles you and lifts you in the same motion. And notice the spirit of the whole thing: "In Christ God was reconciling the world to himself, not counting their trespasses against them" (2 Corinthians 5:19). Not counting. The ledger you keep against yourself, God has stopped keeping.

So what is left for us to do? Lewis says the perfect repentance has been performed; our part is to let Christ reproduce it in us — to stop thrashing and let the strong swimmer carry us. You do not have to understand the physics of rescue. You have to stop insisting you can make shore on your own.

Going Deeper

Tonight, do something almost embarrassingly simple. Take a scrap of paper and write down the one thing you most need to turn from — the thing you have tried to quit before. Then, instead of writing a self-improvement plan next to it, write Lewis's sentence: "He could do it perfectly because He was God." Pray it back: "Jesus, perform your perfect turning in me, right here." Repentance is not your gift to God. It is his gift to you. Ask for it.