A key opens what would otherwise remain shut. When Jesus promises the keys of the kingdom, he is entrusting an authority to be exercised. The church receives more than a picture for its architecture: sinners are to hear forgiveness, and unrepentant sin is not to be called harmless.
The Word
κλείς (kleis) means key. In Matthew 16:19, Jesus uses the plural when speaking to Peter about the kingdom of heaven. The image concerns access and authority.
The authority belongs to Christ before it is entrusted to anyone else. A servant using the keys does not become the owner of the house or acquire permission to contradict its Lord.
Range of Meaning
Revelation 1:18 depicts the risen Jesus holding the keys of death and Hades. In Revelation 3:7 he holds the key of David: his opening cannot be overturned by another’s shutting. These images proclaim his victorious authority.
Matthew connects the keys with binding and loosing. Matthew 18:18 repeats the binding and loosing language in the context of addressing sin within the church, while John 20:23 speaks directly of forgiving and retaining sins. Those two passages explain the church’s authority without using the noun kleis.
Where You’ll Meet It
Jesus tells Peter:
“I will give you the keys of the kingdom of heaven.” (Matthew 16:19, NET)
Peter has confessed Jesus as the Christ, the Son of the living God. Jesus then promises to build his church. The keys belong within this setting of Christ’s identity, promise, and action.
In Matthew 18, the aim of confronting a sinning brother is to regain him. If he refuses correction, the matter comes before the church. Binding and loosing serve repentance and reconciliation, not a contest over who can exercise the most control.
What Confessional Lutherans Hear
The Treatise on the Power and Primacy of the Pope argues that the keys belong to the whole church, citing Matthew 18 and the corresponding authority given to the apostles (Treatise 23–24). The church calls ministers to exercise this authority publicly; the keys do not disappear when papal claims are rejected.
The Small Catechism’s section on Confession teaches us to receive absolution from the confessor as from God himself. Its certainty rests on Christ’s forgiveness, not on the confessor’s personal ability to read the heart.
Retaining sins is likewise bound to Christ’s Word. It is not permission to withhold forgiveness from a penitent person because a minister remains offended or dislikes him.
Where People Get It Wrong
Roman Catholic teaching understands Peter’s commission as a distinctive office continued in the bishops of Rome, serving the unity of the church. It also recognizes the ministry of other bishops; its claim is not that the pope alone can forgive sins.
The Lutheran objection concerns the asserted divine right of that universal primacy. The shared authority in Matthew 18 and John 20 supports the Treatise’s account of the keys as Christ’s gift to his church. Rejecting the papal claim must not reduce absolution to helpful advice or leave the authority unused.
So What
Confession need not end with an estimate of whether you have sounded sorry enough. Christ has given his church forgiveness to speak to repentant sinners.
Receive that word with confidence. The minister is a servant, and the promise he delivers belongs to the Lord who opened the kingdom by his death and resurrection.