1 tn Grk “know him.” See the note on the phrase “know God” in 1 John 2:3 for explanation.
2 tn The Greek verb μένω (menw) is commonly translated into contemporary English as “remain” or “abide,” but both of these translations have some problems: (1) “Abide” has become in some circles almost a “technical term” for some sort of special intimate fellowship or close relationship between the Christian and God, so that one may speak of Christians who are “abiding” and Christians who are not. It is accurate to say the word indicates a close, intimate (and permanent) relationship between the believer and God. However, it is very important to note that for the author of the Gospel of John and the Johannine Epistles every genuine Christian has this type of relationship with God, and the person who does not have this type of relationship (cf. 2 John 9) is not a believer at all (in spite of what he or she may claim). (2) On the other hand, to translate μένω as “remain” removes some of these problems, but creates others: In certain contexts, such a translation can give the impression that those who currently “remain” in this relationship with God can at some point choose not to “remain”, that is, to abandon their faith and return to an unsaved condition. While one may easily think in terms of the author’s opponents in 1 John as not “remaining,” the author makes it inescapably clear in 2:19 that these people, in spite of their claims to know God and be in fellowship with God, never really were genuine believers. (3) In an attempt to avoid both these misconceptions, this translation renders μένω as “reside” except in cases where the context indicates that “remain” is a more accurate nuance, that is, in contexts where a specific change of status or movement from one position to another is in view.
sn The Greek word μένω (menw) translated resides indicates a close, intimate (and permanent) relationship between the believer and God. It is very important to note that for the author of the Gospel of John and the Johannine Epistles every genuine Christian has this type of relationship with God, and the person who does not have this type of relationship (cf. 2 John 9) is not a believer at all (in spite of what he or she may claim).
3 tn Grk “in him.” Context indicates a reference to God since a different pronoun, ἐκεινος (ekeinos), is used later in the same verse to indicate a reference to Jesus. See the note on “Jesus” later in this verse.
4 tn That is, ought to behave in the same way Jesus did. “Walking” is a common NT idiom for one’s behavior or conduct.
5 tn Grk “that one.” Context indicates a reference to Jesus here. It is clear that ἐκεῖνος (ekeinos) here does not refer to the same person as αὐτῷ (autw) in 2:6a. The switch to ἐκεῖνος indicates a change in the referent, and a reference to Jesus Christ is confirmed by the verb περιεπάτησεν (periepathsen), an activity which can only describe Jesus’ earthly life and ministry, the significance of which is one of the points of contention the author has with the opponents. In fact, ἐκεῖνος occurs 6 times in 1 John (2:6; 3:3, 5, 7, 16; and 4:17), and each one refers to Jesus Christ.
6 tn Grk “the one saying he is in the light and hating his brother.” Here καί (kai) has been translated as “but” because of the contrast present in the two clauses.
7 tn Grk “his brother.” Here the term “brother” means “fellow believer” or “fellow Christian” (cf. BDAG 18 s.v. ἀδελφός 2.a). In the repeated uses of this form of address throughout the letter, it is important to remember that sometimes it refers (1) to genuine Christians (those who have remained faithful to the apostolic eyewitness testimony about who Jesus is, as outlined in the Prologue to the letter, 1:1-4; an example of this usage is 2:10; 3:14, 16), but often it refers (2) to the secessionist opponents whose views the author rejects (examples are found here at 2:9, as well as 2:11; 3:10; 3:15; 3:17; 4:20). Of course, to be technically accurate, in the latter case the reference is really to a “fellow member of the community”; the use of the term “fellow Christian” in the translation no more implies that such an individual is genuinely saved than the literal term “brother” which the author uses for such people. But a translation like “fellow member of the community” or “fellow member of the congregation” is extremely awkward and simply cannot be employed consistently throughout.