¹ tn The ἵνα (Jina) clause is best understood (1) as epexegetical (or explanatory), clarifying the love (ἀγάπην, agaphn) that the Father has given to believers. Although it is possible (2) to regard the ἵνα as indicating result, the use of ποταπήν (potaphn, “what sort of”) to modify ἀγάπην suggests that the idea of “love” will be qualified further in the following context, and this qualification is provided by the epexegetical ἵνα clause.

² tn “Indeed” is not in the Greek text but is supplied to indicate emphasis.

³ tc The phrase καὶ ἐσμεν (kai esmen, “and we are”) is omitted in 049 69 Ï. There seems to be no theological reason to omit the words. This has all the earmarks of a classic case of homoioteleuton, for the preceding word (κληθῶμεν, klhqwmen, “we should be called”) ends in -μεν (-men).

tn The indicative mood indicates that the verb ἐσμέν (esmen) at the end of 3:1a is not governed by the ἵνα (Jina) and does not belong with the ἵνα clause, since this would have required a subjunctive. If the verb ἐσμέν were subjunctive, the force of the clause would be “that we should be called children of God, and be (children of God).” With ἐσμέν as indicative, the clause reads “that we should be called children of God, and indeed we are (children of God).”

⁴ tn Lexically it is clear that this phrase indicates reason, but what is not clear is whether (1) τοῦτο (touto) refers to what follows, (2) to what precedes, or (3) to both (as with the ἐν τοῦτο [en touto] phrases throughout 1 John). Διὰ τοῦτο (dia touto) occurs 15 times in the Gospel of John, and a pattern emerges which is so consistent that it appears to be the key to the usage here. Six times in the Gospel of John (5:16, 18; 8:47; 10:17; 12:18, 39) the phrase refers to what follows, and in each of these instances an epexegetical ὅτι (Joti) clause follows. Nine times in John (1:31, 6:65, 7:21-22, 9:23, 12:27, 13:11, 15:19, 16:15, 19:11) the phrase refers to what precedes, and in none of these instances is it followed by a ὅτι clause. The phrase διὰ τοῦτο is used three times in the Johannine Epistles. In two of these (1 John 4:5, 3 John 10) there is no ὅτι clause following, and so the διὰ τοῦτο should refer to preceding material. Here in 3:1 there is an epexegetical ὅτι clause following, so the διὰ τοῦτο should (unless it is the only exception in the Gospel of John and the Johannine Epistles) refer to what follows, that is, to the ὅτι clause itself. This is indicated by the colon in the translation.

⁵ sn The pronoun him is a clear reference to Jesus Christ (compare John 1:10).

⁶ sn Since the author states that Cain…was of the evil one (ἐκ τοῦ πονηροῦ, ek tou ponhrou), in the immediate context this imagery serves as an illustration of 3:8a: The person who practices sin is of the devil (ἐκ τοῦ διαβόλου, ek tou diabolou). This is similar to John 8:44, where Jesus told his opponents “you people are from your father the devil…[who] was a murderer from the beginning.” In both Jewish and early Christian writings Cain is a model for those who deliberately disbelieve; Testament of Benjamin 7:5 looks forward to the punishment of those who “are like Cain in the envy and hatred of brothers.” It is not difficult to see why the author of 1 John used Cain here as a model for the opponents in light of their failure to “love the brothers” (see 1 John 3:17).

⁷ tn For the Greek verb σφάζω (sfazw) L&N 20.72 states, “to slaughter, either animals or persons; in contexts referring to persons, the implication is of violence and mercilessness – ‘to slaughter, to kill.’” As a reflection of this nuance, the translation “brutally murdered” has been used.