Matthew 16:18

It is the name Jesus gave to Simon. It is a masculine singular noun meaning a stone or a piece of rock. There is a clear resonance with the feminine noun that follows, 'petra', which underscores the wordplay and the connection between Peter and the 'rock' on which the church will be built.

While 'Petros' (G4074) refers to a stone (possibly a loose stone or fragment), 'petra' (G4073) denotes a mass of solid rock, a crag, or a rocky foundation. Jesus' choice to use the feminine term 'petra' after referring to Peter as 'Petros' is the source of enormous interpretive tension. Is the 'petra' Peter himself (as a representative of his foundational function), his confession of Jesus, or Christ himself? The text does not explicitly specify this, allowing for multiple readings that have strong exegetical support.

Derived from 'ek' (out of) and 'kaleo' (to call), meaning 'the called out ones.' In classical Greek, 'ekklesia' was the assembly of citizens of a polis for political matters. In the Septuagint (LXX), it translates the Hebrew 'qahal,' the 'assembly of Israel,' especially in religious and covenantal contexts. Jesus' phrase 'my ekklesia' is the first appearance of the word in the Gospels. It implies a community that is new in its relationship with Him, but with deep roots in the Old Testament concept of the assembly of God. It does not refer to a building, but to a gathered group of people.

'Hades' is the abode of the dead. 'Gates' symbolize the power, authority, or strength of a place. Thus, 'the gates of Hades' represent the power of death, destruction, or evil spiritual forces associated with the realm of the dead. The promise is that these powers will not be able to prevail against the church of Christ, not that the church will be exempt from attacks or suffering.

Patristic

The Church Fathers offered various interpretations regarding the identity of 'this rock.' Origen (184-253), in his 'Commentary on Matthew,' argued that the rock upon which the Church is built is not limited to Peter alone: all who share the same faith and virtue are 'Petros,' living stones of the ecclesial edifice. The relevant passage is found in Book XII of the Commentary on Matthew (In Matthaeum XII, 10-11), preserved in Greek and transmitted in PG 13, cols. 997-1004, with the specific discussion of 'this rock' occurring around cols. 1000-1001. Tertullian (c. 160 - c. 220), in 'De Pudicitia' (On Modesty), ch. 21, polemicizes against those who invoke Mt 16:18 to claim for a bishop—including the bishop of Rome—the authority to absolve grave sins, arguing that such a promise was made to Peter personally and is not transferable by hierarchical succession. The Latin text is preserved in CSEL 20 and in PL 2 (the column numbers vary by edition; cols. 1047-1048 cited in the original text correspond to a different section of the same treatise, with the core passage found at cols. 1023-1026 in standard editions). The original text's interpretation is therefore more nuanced than a straightforward assertion that the Church was built upon Peter. Augustine of Hippo (354-430), in his 'Retractations' (Retractationes I, 21, 1), explicitly acknowledged two legitimate readings of the verse: one identifying Peter as the rock, and another—which he declares his preference—whereby the rock is Christ Himself, confessed by Peter. The reference at PL 32, col. 618, is accurate and corresponds to the authentic text. Chrysostom (c. 349-407), in his Homily 54 on Matthew (In Matthaeum Homilia LIV, 2-3), consistently interprets the 'rock' as the faith expressed in Peter's confession, rather than as Peter's person as such. The reference PG 58, cols. 534-536, is more precise for the exegetical core of that homily; cols. 531-532 correspond to the opening of the passage.

Reformed

The Reformed tradition, following Calvin and many Fathers, interprets 'this rock' as Peter's confession that Jesus is the Christ, the Son of God. The 'ekklesia' is then the assembly of those who share this fundamental faith. Peter is significant not because of his person per se, but as the first to articulate that divinely revealed truth. The authority of the keys is understood as the authority of the preached gospel, which opens or closes the kingdom of heaven. The church is seen as the community of true believers, built on Christ himself as the cornerstone (Eph 2:20).

Interpretive tension: Interpretive tension arises when considering how the invincibility of the 'ekklesia' ('the gates of Hades will not prevail') manifests in the visible church, which historically has been plagued by divisions, heresies, and moral failures. Does it mean that only the invisible church is invincible? And if so, what is the promise for the visible church?

Arminian

The Arminian tradition shares with the Reformed the interpretation of 'this rock' as Peter's confession, or Christ himself through that confession. However, it emphasizes the active human response of faith and obedience in the formation and preservation of the 'ekklesia.' Peter is an example of the response of faith that every believer must emulate. The promise of the church's invincibility is for those who persevere in faith and love for Christ, and its fulfillment depends, in part, on the continuous faithfulness of its members.

Interpretive tension: The tension within Arminianism is how to reconcile Jesus' unbreakable promise that 'the gates of Hades will not prevail' with the possibility of individuals or even entire communities falling from grace. If the church is vulnerable to human unfaithfulness, what is the nature of the divine guarantee? Is it a conditioned promise or a sovereign declaration?

Contemporary

Contemporary Catholic scholars (e.g., Joseph Fitzmyer) recognize the importance of Peter's confession but maintain that the 'Petros/petra' wordplay implies Peter's person as the visible foundation and primacy of the church, with authority to bind and loose, and his successors. Protestant scholars (e.g., R.T. France, D.A. Carson) often insist that 'petra' refers to the confession or Christ, with Peter as the first confessor. N.T. Wright argues that the passage is about Jesus' identity as Messiah and the establishment of a new messianic community on the basis of that confession, which is embodied and proclaimed by the apostles, with Peter at their head.