3 John 1

The word “From” is not in the Greek text, but has been supplied to indicate the sender of the letter.
the elder,
Or “presbyter.”
The author’s self-designation, the elder, is in keeping with the reticence of the author of the Gospel of John to identify himself. This is the same self-designation used by the author of 2 John.
to Gaius
Little reliable information is available concerning the identity of the person to whom 3 John is addressed. Because the name Gaius was very common in the Roman Empire, it is highly unlikely that the person named here is to be identified with any of the others of the same name associated with Paul (1 Cor 1:14, Rom 16:23 [these two references are probably to the same person]; Acts 19:29, Acts 20:4). A 4th century tradition recorded in the Apostolic Constitutions 7.46.9 (ca. a.d. 370) states that John the Apostle ordained Gaius as bishop of Pergamum, but this is questionable because of the relatively late date. The only certain information about this individual must be obtained from 3 John itself, and there is not a great deal there. It is obvious that this person is well known to the author, but it is not so certain whether they had met personally or not, because the report of Gaius’ conduct toward the brothers is received secondhand by the author (v. 3). Nor can it be determined with certainty whether Gaius belonged to the same local church as Diotrephes (v. 9), or was himself the leader of another local congregation. It is clear that the author regarded him as orthodox (v. 3) and a valuable ally in the controversy with the secessionist opponents and their false Christology discussed at length in 1 John.
my dear brother, whom I love in truth.
The prepositional phrase ἐν ἀληθείᾳ (en alēqeia) in 3 John 1 is similar to 2 John 1, although it is not qualified here as it is there (see 2 John 1). This is not merely the equivalent of an adverb (“truly”), but is a theological statement affirming the orthodoxy of Gaius, to whom the letter is addressed. “Truth” is the author’s way of alluding to theological orthodoxy in the face of the challenge by the opponents (see 1 John 3:19).
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