Why did Jesus have to live?
Most Christians can answer why Jesus had to die. He died for our sins. He bore the judgment we deserved. He reconciled us to God through his sacrificial death on the cross. Still, that answer raises another question. If Jesus came primarily to die, why did he spend more than thirty years living in perfect obedience before going to the cross? The question lies at the heart of the gospel.
Closely related is another question: On what basis can God legally declare guilty sinners righteous? The answer to both questions is found in the righteousness of Jesus Christ.
The Problem Is Greater Than Guilt
Many Christians think of salvation almost entirely in terms of forgiveness. Humanity sinned, so humanity needs pardon. While this is true, it is not the whole story. Scripture presents humanity’s problem as deeper than guilt alone.
Adam was not created merely to avoid sin. He was created to obey God. He was called to love God, serve God, and fulfill the vocation God entrusted to him. The issue in Eden was not simply the avoidance of evil but the rendering of faithful obedience. This distinction is crucial. Forgiveness removes guilt. Righteousness provides a positive standing before God.
Charles Hodge asked the question that every sinner must eventually face: “How shall a man be just with God? If our moral excellence be not the ground on which God pronounces us just, what is that ground?”¹ The problem is not merely that sinners have broken God’s law. The problem is that sinners possess no righteousness capable of satisfying God’s justice. Consequently, salvation requires more than the removal of guilt. It requires the provision of righteousness.
The New Testament repeatedly presents Christ’s earthly life as a mission of obedience. At the beginning of his public ministry, Jesus tells John the Baptist, “it is fitting for us to fulfill all righteousness” (Matt 3:15). This statement serves as a summary of his entire mission.
Likewise, Paul writes that Christ was “born of woman, born under the law” (Gal 4:4). The Son of God entered history under the obligations of God’s law. He came not only to suffer its curse but also to fulfill its demands. Throughout John’s Gospel, Jesus repeatedly describes himself as the obedient Son:
- “My food is to do the will of him who sent me and to accomplish his work” (John 4:34).
- “I always do the things that are pleasing to him” (John 8:29).
- “I glorified you on earth, having accomplished the work that you gave me to do” (John 17:4).
Michael Horton captures the significance saying: “For the first time, the world has an Adam and Israel has a king who will do only what he hears the Father say.”² Jesus did not merely avoid sin. He actively fulfilled the Father’s will. Every thought, every word, every deed, and every desire perfectly conformed to God’s righteousness.
The Obedience of Christ for Us
The central biblical text for understanding Christ’s active righteousness is Romans 5. Paul structures the passage around a comparison between Adam and Christ. Adam’s disobedience brought condemnation. Christ’s obedience brings justification and life.
Romans 5:19 states: “For as by the one man’s disobedience the many were made sinners, so by the one man’s obedience the many will be made righteous.” Notice carefully what Paul says.
- He does not contrast Adam’s disobedience with Christ’s death.
- He contrasts Adam’s disobedience with Christ’s obedience.
- The entire career of Adam’s rebellion is answered by the entire career of Christ’s obedience.
How are the many made righteous? Jesus “has achieved this for us by the whole course of his obedience.”³ The phrase “whole course of his obedience” captures the biblical picture perfectly. Jesus’s righteousness was not produced in a single moment. It was formed throughout an entire life of covenant faithfulness.
Not Merely Sinless but Righteous
Christ was not merely sinless. A person could theoretically avoid wrongdoing without positively fulfilling every aspect of God’s will. Scripture, however, presents Jesus as far more than a non-transgressor.
- He actively fulfilled righteousness.
- He perfectly loved the Father.
- He perfectly obeyed the law.
- He perfectly accomplished the mission given to him.
Horton writes: “Not just the absence of sin, but the total positive obedience in thought, word, deed, and motivation rendered Jesus Christ both a perfect offering for sin and a fragrant ‘living sacrifice’ of praise.”⁴ This distinction helps explain why Christ’s life matters.
The righteousness believers need is not merely innocence. It is perfect obedience. Only Christ possesses that righteousness.
The Priestly Life of Christ
Hebrews provides another important perspective. Quoting Psalm 40, the author presents Christ entering the world saying: “Behold, I have come to do your will, O God” (Heb 10:7). The entire incarnate life of Jesus is portrayed as a mission of obedience. Herman Bavinck writes: “His whole life is to be viewed as a fulfilling of God’s justice, His law, and His commandment.”⁵ Therefore, Christ’s priestly work does not begin at Calvary. His entire life is priestly. Every act of obedience is part of his mediatorial mission.
The cross is not separate from that obedience. It is its culmination. As Paul says, Christ became “obedient unto death, even death on a cross” (Phil 2:8). The cross is the highest expression of a life already characterized by perfect obedience.
The Imputation of Christ’s Righteousness
How does Christ’s righteousness become ours? The classical answer is through imputation. Jeremiah prophesied concerning the Messiah: “And this is the name by which he will be called: ‘The LORD is our righteousness'” (Jer 23:6). Paul likewise declares that Christ “became to us wisdom from God, righteousness and sanctification and redemption” (1 Cor 1:30).
Hodge explains: “The righteousness of Christ is imputed to the believer for his justification.”⁶ To impute means to credit, reckon, or account something to another. This language dominates Romans 4. God reckons righteousness to believers through faith. The same truth appears in 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.”
The gospel involves a profound exchange. Christ bears our guilt. We receive his righteousness. Consequently, believers stand before God clothed not in their own obedience but in the obedience of Christ.
Why This Doctrine Matters
At first glance, the doctrine of Christ’s active righteousness may appear to be a technical theological discussion. It is not. At stake is the nature of salvation itself.
Did Christ merely remove condemnation? Or did he positively secure the righteousness necessary for eternal life? The biblical answer is the latter. Humanity needed more than forgiveness. Humanity needed righteousness. Adam failed to provide it. Israel failed to provide it. Every human being has failed to provide it. Only Christ succeeded.
As Hodge writes, believers rely for acceptance with God “not on himself but on Christ, not on what he is or has done, but on what Christ is and has done for him.”⁷ This is why Jesus had to live.
His life was not merely preparation for the cross. His life was part of the saving work itself. The obedience rendered throughout his earthly ministry belongs to the righteousness that justifies God’s people.
Conclusion
The question with which we began now has an answer. Why did Jesus have to live? Because sinners need more than pardon. They need righteousness.
The Son entered history as the last Adam, the true Israel, and the obedient Son. He fulfilled every demand of God’s law and accomplished every task entrusted to him by the Father.
God does not merely forgive believers. He justifies them. He declares them righteous. Not because they possess righteousness in themselves, but because they are united to the One who is their righteousness.
Jesus did not merely die for his people. He lived for them. And because he lived for them, God can forever declare them righteous in his sight.
Notes
- Charles Hodge, Systematic Theology, 3 vols. (Grand Rapids: Eerdmans, 1871–73), 3:141.
- Michael Horton, The Christian Faith: A Systematic Theology for Pilgrims on the Way (Grand Rapids: Zondervan, 2011), 491.
- John Calvin, Institutes of the Christian Religion, 2.16.5.
- Horton, Christian Faith, 492.
- Herman Bavinck, Our Reasonable Faith, trans. Henry Zylstra (Grand Rapids: Eerdmans, 1956), 336.
- Hodge, Systematic Theology, 3:144.
- Hodge, Systematic Theology, 3:142.
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