Catholic Commentary
The Beloved Disciple's Testimony and the Epilogue
24This is the disciple who testifies about these things, and wrote these things. We know that his witness is true.25There are also many other things which Jesus did, which if they would all be written, I suppose that even the world itself wouldn’t have room for the books that would be written.
John 21:24–25 consists of the Gospel's final attestation of authorship and a concluding claim about the incompleteness of the written record. The passage affirms that the Beloved Disciple witnessed and authored these events while acknowledging that Jesus performed countless other deeds too numerous for any written account to contain.
The Gospel closes not with certainty contained but with infinite mystery—a world too small to hold the books that could be written about what Jesus did.
This verse draws on a well-attested Jewish literary convention (cf. Ben Sira 43:27–28, Ecclesiastes 12:12) of acknowledging the incompleteness of any written account of divine wisdom or action. But John amplifies it to a cosmic scale. The "many other things" (polla kai alla) is not an admission of editorial failure but a testimony to inexhaustibility. The Jesus who has been revealed in this Gospel — as incarnate Word, Lamb of God, Bread of Life, Resurrection and Life, Good Shepherd — is inexhaustibly more than any text can contain.
In the spiritual or anagogical sense, verse 25 invites the reader to understand that the Gospel is not an encyclopedia of Jesus but an icon — a window into One who exceeds all representation. The written Word points beyond itself to the Living Word. Reading the Gospel is not completion; it is initiation.
Catholic theology brings several distinctive resources to these closing verses.
On Inspiration and the Role of the Community: Vatican II's Dei Verbum (§11) teaches that the sacred books were written "under the inspiration of the Holy Spirit" with God as their "author," yet through genuinely human authors who used their "own faculties and powers." Verse 24 perfectly illustrates this: the Beloved Disciple writes as a human witness (martyrōn), and the community authenticates that witness as true. This is not a contradiction but a model of inspired authorship — personal testimony, communal discernment, and divine guarantee held together. The "we know" of verse 24 anticipates the Church's own act of canonization: Scripture is received and recognized by the community of faith as divinely authoritative (CCC §120).
On the Inexhaustibility of Divine Revelation: Verse 25 coheres profoundly with Dei Verbum §8, which speaks of Tradition and Scripture as together forming "one sacred deposit of the Word of God." If the written Gospel cannot exhaust the mystery of Christ, then living Tradition — the ongoing life of the Church guided by the Spirit — carries what the text cannot fully hold. This is not a diminishment of Scripture but its proper orientation: toward the person of Jesus Christ, who is himself the fullness of Revelation (Dei Verbum §2; CCC §65).
St. Thomas Aquinas, commenting on this verse (Super Evangelium S. Ioannis, ch. 21, lec. 6), notes that John's hyperbole signals that even a perfect written account would not produce faith the way a living encounter with Christ does — a point with deep sacramental implications. The Eucharist is precisely where the "many things Jesus did" continue to unfold in history, beyond any page.
Pope Benedict XVI, in Verbum Domini (§17), echoes this when he writes that "the word of God transcends the Scriptures" — the written text is the privileged but not exhaustive locus of the divine Word. John 21:25 is, in a sense, the biblical warrant for that conviction.
For a contemporary Catholic, these two verses offer a corrective to two opposite temptations.
The first is the temptation of skepticism about the Gospels — the cultural pressure to treat the New Testament as legend, agenda, or myth. Verse 24 is a direct counter: this is testimony, not invention. The "we know that his witness is true" is an ancient community staking its life on what was seen. Early Christian martyrs died not for ideas but for an eyewitness account they judged reliable. This matters when a Catholic faces doubt: the faith is anchored in testimony, not in feeling.
The second is the temptation of biblical minimalism — reducing Christian life to what is explicitly written, treating the text as a closed system. Verse 25 dismantles that. If the world cannot hold the books that could be written about Jesus, then the prayer life, sacramental encounters, and mystical tradition of 2,000 years of saints are not additions to Christ but discoveries of Him. Every Eucharist, every genuine confession, every act of charity done in His name is one more unwritten book. The Catholic who prays lectio divina, who receives the sacraments, who studies the saints, is not supplementing Christ — they are meeting the inexhaustible One whom even John could not fully write down.
Commentary
John 21:24 — "This is the disciple who testifies… and wrote these things."
The shift to the third person here is decisive. Throughout chapter 21 the narrator has referred to "the disciple whom Jesus loved" (vv. 7, 20), but now the community steps forward — the "we" — to identify this figure explicitly as both witness and author. Two distinct but related claims are being made: that the Beloved Disciple is the source of the testimony (ho martyrōn) and that he is in some meaningful sense responsible for the written Gospel (ho grapsas). Catholic tradition, from Irenaeus of Lyon (Against Heresies III.1.1) to the Pontifical Biblical Commission's 2003 document The Jewish People and Their Sacred Scriptures, has consistently identified this figure with John the Apostle, son of Zebedee, though the precise mechanics of composition — personal autograph, dictation, editorial shaping by a Johannine school — have been discussed with nuance since antiquity. What is unambiguous is the testimonial claim: this is not fiction, not allegory detached from history, but martyr-witness (martyria) of one who saw.
The phrase "We know that his witness is true" is a community ratification, almost a liturgical acclamation, echoing the juridical requirement of Deuteronomy 19:15 that truth be established by multiple witnesses. The "we" is almost certainly the Johannine community — the circle of disciples gathered around the Beloved Disciple — now presenting the Gospel to a wider church. This mirrors the structural logic of 1 John 1:1–4, where the same community says "we have seen, we have heard, we testify." It is, in miniature, the Church's act of receiving Scripture as trustworthy: a communal, not merely individual, acknowledgment of inspired truth.
The verb grapsas (aorist participle) carries weight: something is now fixed, handed over, entrusted. The living oral tradition has been crystallized into a text. In patristic typology, Origen sees in the Evangelist John the eagle of Ezekiel 1 and Revelation 4:7 — the one who soars highest in theological contemplation — and this final self-attestation is, in that reading, the eagle's landing: the vision captured in permanent form for the Church.
John 21:25 — "There are also many other things which Jesus did…"
The hyperbole here is not rhetorical decoration but theological precision. The Greek oimai ("I suppose") is one of only two uses of the first-person singular in the entire Gospel (cf. 19:35 in some manuscripts), a sudden, intimate intrusion of the author's own voice — an almost breathless aside. The image of not having room for the books is a deliberate reversal of the opening of the Gospel: in the Prologue, the Logos through whom all things were made enters the world; here, at the close, the world itself is too small to contain the record of his deeds. The cosmological bookends are intentional.