The Sufficient Cross Still Needs Good Works

By Karlo Broussard

The keys of the kingdom reveal Peter’s unique authority within Christ’s Church and show how the office of the royal steward in the Davidic kingdom provides the biblical background for understanding the Papacy.

I. The royal steward and the key of David (Isaiah 22:19-23) – Isaiah describes the authority given to Eliakim: “I will place the key of the House of David on Eliakim’s shoulder; when he opens, no one shall shut, when he shuts, no one shall open.”

The office of the royal steward – The Davidic kingdom included an office known as the royal steward or master of the palace. The steward possessed authority over the king’s household second only to the king. The “key of the house of David” symbolized this authority. The steward possessed authority to admit or exclude people from the royal household. He also served as “a father” to the inhabitants of Jerusalem and Judah.

The Old Testament background – The key was not merely an object but a sign of an established office. Understanding this office provides the biblical context for Jesus’ words to Peter. Jesus is establishing His kingdom in continuity with the Davidic kingdom.

Key takeaway: The key of David symbolizes a real office of authority within the king’s household, providing the Old Testament background for the authority Christ gives to Peter.

II. Peter receives the keys of Christ’s kingdom (Matthew 16:16-20) – Jesus tells Peter: “I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven.”
Peter as Christ’s royal steward – Jesus is the Davidic King. Like the steward who received the key to David’s kingdom, Peter receives the keys to Christ’s kingdom. Peter therefore serves as the chief steward of Christ’s household, the Church. His authority remains subordinate to Christ, the King.

Peter’s unique authority – Jesus gives Peter both the keys and the authority to bind and loose. The other apostles later receive authority to bind and loose in Matthew 18:18. Only Peter receives the keys. This distinction identifies Peter as the chief steward among the apostles.
One chief steward – The other apostles genuinely share in governing the Church. Peter nevertheless possesses a unique role among them. Just as the Davidic kingdom had one chief steward, Christ appoints Peter to a singular office within His Church.

Key takeaway: The keys identify Peter as Christ’s chief steward, possessing a unique governing authority within the kingdom while remaining completely subordinate to Christ.

III. Why Isaiah 22 provides the context for Matthew 16 (Isaiah 22:22; Matthew 16:19) – Some argue that keys, doors, and gates are common biblical images, so Jesus’ words need not refer to Isaiah 22.
The unique Old Testament reference – Key imagery can have different meanings throughout Scripture. But Isaiah 22:22 is the only Old Testament passage using a key as a metaphor in this way. Both passages concern authority within a kingdom. Both connect the key with the ability to admit and exclude. Isaiah speaks of opening and shutting, while Jesus speaks of binding and loosing.
Other uses of keys do not undermine the connection – Scripture also speaks of the “key of knowledge” and the “keys of death and Hades.” These clearly refer to different realities. The question is not whether keys can symbolize different things. The question is what Old Testament background best explains the keys of a kingdom given to Peter. Isaiah 22 provides the strongest parallel.

Key takeaway: The shared imagery of keys, kingdom, and governing authority makes Isaiah 22 the natural biblical background for Jesus’ appointment of Peter.

IV. Biblical parallels do not require every detail to match (Isaiah 22:15-25; Matthew 16:16-20) – Some object that the comparison between Peter and the royal steward cannot work unless every detail in Isaiah applies directly to Peter.
How biblical foreshadowing works – Scripture regularly applies an Old Testament passage to a New Testament fulfillment without applying every detail. Matthew himself does this when he applies Hosea 11:1, “Out of Egypt I called my son,” to Jesus. The surrounding details concerning Israel’s idolatry obviously do not apply to Christ. Biblical parallels can therefore contain both similarities and differences.
Christ’s kingdom surpasses the old kingdom – Jesus is both God and the Davidic King. Peter receives the steward’s authority but remains subordinate to Christ. Unlike the old Davidic kingdom, Christ promises that the gates of Hades will not prevail against His Church. The fulfillment is greater and more permanent than the Old Testament institution that foreshadowed it.

Key takeaway: The connection between Isaiah and Matthew does not depend on every detail being identical. The Old Covenant office provides the pattern that Christ fulfills and elevates in His Church.

V. The keys point toward an enduring office (Matthew 16:18-19) – Jesus says: “I will build my church, and the gates of the netherworld shall not prevail against it.”
Peter’s task is to govern – Jesus, not Peter, builds the Church. Peter is entrusted with governing Christ’s household. The Church is promised to endure beyond Peter’s lifetime.
The need for succession – If the Church continues, the governing function entrusted to its chief steward must continue. Peter’s role is not simply a one-time task of founding the Church. Jesus builds the Church, while Peter is entrusted with governing it. Since the Church continues until the end of time, the office of chief steward must continue beyond Peter.
Christ always remains King – The authority ultimately belongs to Christ. Revelation 3:7 describes Jesus Himself as possessing the key of David. Christ’s possession of the key does not prevent Him from entrusting authority to Peter. Peter exercises authority because Christ chooses to share it with him.

Key takeaway: The Papacy does not compete with Christ’s kingship. The pope exercises a stewardship entrusted by Christ, while Christ remains the supreme King and head of His Church.

Conclusion – Across the readings: Isaiah reveals the office of the royal steward who governs the Davidic king’s household. Jesus gives Peter the keys of His kingdom and establishes him as chief steward of the Church. Peter receives an authority distinct from, though shared with, the other apostles. The Old Testament background helps explain both Peter’s unique authority and the continuing nature of his office. Christ remains the King from whom all ecclesial authority comes.
Final takeaway: When Jesus gives Peter the keys of the kingdom, He is not merely offering a personal honor. He is entrusting Peter with an office. As the royal steward governed the household of the Davidic king, Peter is appointed to govern Christ’s Church under the authority of Christ the King, providing the biblical foundation for understanding the Papacy.

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