Three Main Purposes of John's Gospel
The Gospel of John, distinct from the Synoptic Gospels (Matthew, Mark, and Luke), presents a unique theological perspective on the life and ministry of Jesus Christ. While the Synoptics largely focus on Jesus's activities in Galilee, John emphasizes his work in Judea and Jerusalem [1]. The author, traditionally identified as John the Apostle, states his primary purpose explicitly within the Gospel itself: "But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name" (John 20:31) [2]. This verse encapsulates the evangelist's threefold aim: to evoke belief in Jesus's identity, to foster life through that belief, and to present Jesus as the Christ, the Son of God.
One central purpose of John's Gospel is to establish Jesus's divine identity as the Christ and the Son of God. Augustine of Hippo noted that while the other three evangelists primarily focused on "those things which Christ did through the vehicle of the flesh of man," John aimed to set forth "that true divinity of the Lord in which He is the Father's equal" [3]. This emphasis on Jesus's divine nature is evident from the Gospel's prologue, which declares Jesus as the pre-existent Word (Logos) who was "with God" and "was God" (John 1:1). The Gospel frequently highlights Jesus's divine claims, such as "I and the Father are one" (John 10:30) and "Before Abraham was, I am" (John 8:58). The repeated use of "I Am" statements throughout the Gospel further underscores Jesus's divine self-revelation, echoing God's name revealed to Moses in Exodus.
A second key purpose is to call readers to belief in Jesus. John 20:31 directly states that the signs and teachings recorded are "written, that ye might believe" [2]. The Gospel presents numerous "signs" (miracles) performed by Jesus, not merely as demonstrations of power, but as evidence pointing to his divine origin and messianic identity. These signs, such as turning water into wine (John 2:1-11) or raising Lazarus from the dead (John 11:1-44), are intended to lead observers and readers to faith. The narrative often includes individuals who come to belief, such as the Samaritan woman (John 4:39-42) or the man born blind (John 9:38), serving as examples for the audience. This call to belief is not merely intellectual assent but a transformative trust in Jesus.
The third purpose, intrinsically linked to belief, is that "believing ye might have life through his name" (John 20:31) [2]. This "life" refers to eternal life, a recurring theme in John's Gospel. Jesus declares, "I am the way, the truth, and the life" (John 14:6) and "I am come that they might have life, and that they might have it more abundantly" (John 10:10). This life is presented as a present reality for those who believe, not merely a future hope. It is a spiritual life, characterized by a relationship with God and participation in his divine nature. John of Damascus, an Eastern Orthodox theologian, articulated that Christ became man "that through Himself and in Himself He might renew that which was made after His image and likeness, and might teach us, too, the conduct of a virtuous life, making through Himself the way thither easy for us, and might by the communication of life deliver us from corruption" [4]. This life is a gift received through faith in Jesus's name, which signifies his person and authority.
While some earlier interpretations suggested John wrote to supplement the Synoptic Gospels by filling in omissions [1], Easton's Bible Dictionary notes that there is "no evidence for this" [2]. Instead, John's distinct approach, focusing on Jesus's divinity and the theological implications of his ministry, serves these specific purposes of fostering belief and granting life. The Gospel was likely written at Ephesus, possibly around A.D. 78 or later, between A.D. 90-100, and was primarily addressed to Christians to cultivate their spiritual life and deepen their relationship with the divine Savior [1].
Sources
- Smith's Bible Dictionary “Smith's Bible Dictionary: John, Gospel Of — This Gospel was probably written at Ephesus about A.D. 78. (Canon Cook places it toward the close of John's life, A.D. 90-100.--ED.) The Gospel was obviously addressed primarily to Christians, not to heathen. There can be little doubt that the main object of St. John, who wrote after the other evangelists, is to supplement their narratives, which were almost confined to our Lord's life in Galilee. (It was the Gospel for the Church, to cultivate and cherish the spiritual life of Christians, and bring them into the closest relations to the divine Savio”
- Easton's Bible Dictionary “Easton's Bible Dictionary: John, Gospel of — The genuineness of this Gospel, i.e., the fact that the apostle John was its author, is beyond all reasonable doubt. In recent times, from about 1820, many attempts have been made to impugn its genuineness, but without success. The design of John in writing this Gospel is stated by himself (John 20:31). It was at one time supposed that he wrote for the purpose of supplying the omissions of the synoptical, i.e., of the first three, Gospels, but there is no evidence for this. "There is here no history of Jesus and his teaching after the manner of the ”
- Schaff ANF/NPNF (Patristic) “NPNF1 Vol 6: Augustine — Homilies on the Gospels — CHAP. IV.--OF THE FACT THAT JOHN UNDERTOOK THE EXPOSITION OF CHRIST'S DIVINITY. (part 1): 7. These three evangelists, however, were for the most part engaged with those things which Christ did through the vehicle of the flesh of man, and after the temporal fashion.(13) But John, on the other hand, had in view that true divinity of the Lord in which He is the Father's equal, and directed his efforts above all to the setting forth of the divine nature in his Gospel in such a way as he believed to be adequate to men's needs and notions.(14) There”
- CCEL (Eastern Orthodox) “John of Damascus, An Exact Exposition of the Orthodox Faith, section 80: in the inferior part, I mean our own nature, in order that through Himself and in Himself He might renew that which was made after His image and likeness, and might teach us, too, the conduct of a virtuous life, making through Himself the way thither easy for us, and might by the communication of life deliver us from corruption, becoming Himself the firstfruits of our resurrection, and might renovate the useless and worn vessel calling us to the knowledge of God that He might redeem us from the tyranny of the devil, and m”