The Second Letter of St. John
Written in response to similar problems, the Second and Third Letters of John are of the same length, perhaps determined by the practical consideration of the writing space on one piece of papyrus. In each letter the writer calls himself “the Presbyter,” and their common authorship is further evidenced by internal similarities in style and wording, especially in the introductions and conclusions. The literary considerations that link 2 John and 3 John also link them with the First Letter and the Gospel of John. The concern with “truth,” christology, mutual love, the new commandment, antichrist, and the integrity of witness to the earthly Jesus mark these works as products of the Johannine school. The identity of the Presbyter is problematic. The use of the title implies more than age, and refers to his position of leadership in the early church. The absence of a proper name indicates that he was well known and acknowledged in authority by the communities to which he writes. Although traditionally attributed to John the apostle, these letters were probably written by a disciple or scribe of an apostle. The traditional place and date of composition, Ephesus at the end of the first century, are plausible for both letters.
Excerpts from Second John:
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The Second Letter of St. John:
 The chosen Lady: literally, “elected”; this could also be translated “Kyria (a woman’s name) chosen (by God)”. The adjective “chosen” is applied to all Christians at the beginning of other New Testament letters (1 Pt 1:1; Ti 1:1). The description is of a specific community with “children” who are its members. The truth: the affirmation of Jesus in the flesh and in contrast to false teaching (1 Jn 1:7).
 Grace, mercy, and peace: like 1 Timothy; 2 Timothy this letter adds mercy to the terms used frequently in a salutation to describe Christian blessing; it appears only here in the Johannine writings. The author also puts the blessing in relation to truth and love, the watchwords of the Johannine teaching. The Father’s Son: the title that affirms the close relationship of Christ to God; similar variations of this title occur elsewhere (Jn 1:14; 3:35), but the precise wording is not found elsewhere in the New Testament.
 His commandments: cf. 1 Jn 3:23; 2:7–8; 4:21; obedience to the commandment of faith and love includes all others.
 The antichrist: see 1 Jn 2:18–19, 22; 4:3.
 Anyone who is so “progressive”: literally, “Anyone who goes ahead.” Some gnostic groups held the doctrine of the Christ come in the flesh to be a first step in belief, which the more advanced and spiritual believer surpassed and abandoned in his knowledge of the spiritual Christ. The author affirms that fellowship with God may be gained only by holding to the complete doctrine of Jesus Christ (1 Jn 2:22–23; 4:2; 5:5–6).
[10–11] At this time false teachers were considered so dangerous and divisive as to be shunned completely. From this description they seem to be wandering preachers. We see here a natural suspicion of early Christians concerning such itinerants and can envisage the problems faced by missionaries such as those mentioned in 3 Jn 10.