Why did Jesus have to die?

What the Bible says

The Bible begins this answer with sin. Sin is not first of all a list of bad deeds. It is a breach between people and God, and Paul says no one is exempt.

for all have sinned and fall short of the glory of God

Rom 3:23

Sin also has a cost.

For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord.

Rom 6:23

Notice the verse sets "wages" beside "gift." Death is something we earned. Life is something we receive. The cross is where the two meet. Centuries before Jesus, Isaiah pictured a suffering Servant who carries other people's sins.

We all like sheep have gone astray, each one has turned to his own way; and the LORD has laid upon Him the iniquity of us all.

Isa 53:6

Jesus understood his own death in this way. When his disciples were arguing about rank, he said:

For even the Son of Man did not come to be served, but to serve, and to give His life as a ransom for many.

Mark 10:45

A ransom is the price paid to set a captive free. The apostles repeated the point. Peter writes that Christ "bore our sins in His body on the tree" (1 Pet 2:24) and suffered "the righteous for the unrighteous" (1 Pet 3:18). Paul says God made the one "who knew no sin to be sin on our behalf" (2 Cor 5:21). The word "for" matters.

Yet Scripture never presents the cross as a cold transaction. At its center is love.

But God proves His love for us in this: While we were still sinners, Christ died for us.

Rom 5:8

The cross is also a victory over evil. Paul says that Christ, "having disarmed the powers and authorities, He made a public spectacle of them, triumphing over them by the cross" (Col 2:15). In the place the world counted most shameful, God won his greatest victory.

The church's witness

The Nicene Creed says that Christ came down for us and for our salvation, and was crucified for us under Pontius Pilate The Nicene Creed. The Heidelberg Catechism answers that our only comfort in life and in death is that body and soul belong to a faithful Savior, and it rests that comfort on his precious blood Heidelberg Catechism, Q1.

The Fathers read the meaning of the cross in the name "Lamb of God." Theophylact says he is so called "because God the Father accepted His death for our salvation" Theophylact. Commenting on the ransom saying, the same Father asks, "what can be greater or more wonderful than that a man should die for him to whom he ministers" Theophylact.

Matthew Henry, on Isaiah 53, ties the cross to our own sins: "Our sins were the thorns in Christ's head, the nails in his hands and feet, the spear in his side" Matthew Henry. On 2 Corinthians 5 he says of Christ, "He was made Sin; not a sinner, but Sin, a Sin-offering, a Sacrifice for sin" Matthew Henry.

An honest word is needed here. The church confessed the fact of the cross with one voice, but it never fixed a single official theory of how the cross saves. There are several pictures. Many early Fathers saw a ransom that frees us from the power of sin and death, or a victory over evil. Irenaeus saw Christ retracing Adam's steps to renew humanity, and Athanasius said that the Word, who is life, took a body to rescue a humanity under death. Anselm in the Middle Ages argued that God's honor and justice must be satisfied, and the Reformers stressed that Christ bore the penalty sinners deserved. Others, like Abelard, put the weight on the love shown at the cross, which turns our hearts. Many Christians hold that these pictures do not cancel one another but light up different sides of one event. Which one comes first differs among traditions, and this essay does not choose.

In the original languages

The word for "ransom" in Mark 10:45 is lutron (λύτρον), the price paid to free a slave or prisoner. In 1 Timothy 2:6 Paul adds a prefix meaning "in place of" and writes antilutron (ἀντίλυτρον). The idea that he stood in our place and paid the price is packed into one word (1 Tim 2:6).

Another word is katallagē (καταλλαγή), "reconciliation," the restoring of a relationship between enemies. Paul writes "that God was reconciling the world to Himself in Christ" (2 Cor 5:19). Notice who begins it. It is not a human offering to calm an angry god. It is God who comes toward us first.

Common objections

"Why doesn't God simply forgive?" This is a serious question. People can cancel a debt, and if God is love it seems he could do so more easily. The objection is right that God wants to forgive. But forgiveness is not free of cost. When someone wrongs me and I forgive, I take the loss on myself. Pretending the wrong did not happen is not forgiveness but indifference. If evil is truly evil, a God who passes over it without dealing with it would not be just. Paul says the cross does both at once: God acts "so as to be just and to justify the one who has faith in Jesus" (Rom 3:26). The center of the gospel is that the God who forgives is the one who pays. We do not fully understand why it had to be this way. As Isaiah says, God's ways are higher than our ways (Isa 55:9).

"Isn't a Father punishing his innocent Son divine child abuse?" If the cross were explained as an angry Father beating a helpless Son to calm himself, the charge would be fair, and the church should repent of any teaching that sounded like that. But the picture of Scripture and the creeds is different. First, Jesus is not a third party dragged in. He is the Son, one in being with the Father, and the Definition of Chalcedon confesses that he is truly God and truly man Definition of Chalcedon. He suffered in the human nature he took, but the cross is not the Father acting against the Son. The Father gave the Son in love (John 3:16), and the Son "offered Himself" through the eternal Spirit (Heb 9:14). One will of the triune God is at work. Second, Jesus was not forced. He said, "No one takes it from Me, but I lay it down of My own accord" (John 10:18). Third, the reason for the cross is love, not rage. For more on this, see Is Jesus God?. The mystery is not fully resolved, and the objection rightly warns us to speak carefully.

"Isn't the idea that death removes sin a leftover from primitive sacrifice?" Blood sacrifice can sound disturbing. But the Old Testament itself points beyond the sacrifices: "The sacrifices of God are a broken spirit" (Ps 51:17). Hebrews goes further: "it is impossible for the blood of bulls and goats to take away sins" (Heb 10:4). The sacrifices were pictures that taught how heavy sin really is, and the New Testament says Jesus accomplished once for all what they pointed to (Heb 10:10). Not everyone will find this satisfying. But for Christians the cross is not a human offering of an animal. It is God giving himself.

Going further

People who try to understand the cross often stop at theory. Scripture, though, gives a name before a theory: the Son of God "loved me and gave Himself up for me" (Gal 2:20). Paul says that the God who "did not spare His own Son but gave Him up for us all" will not hold back anything from us (Rom 8:32).

Ask yourself: do I treat sin lightly? Or do I think my sin is too great to be forgiven? If the cross is God's proof of love for me, what do I need to set down before that love?

To read further, see Did Jesus really rise from the dead? and What is grace?