1 John 2:5

2:5 But whoever obeys his ¹  word, truly in this person ²  the love of God has been perfected. By this we know that we are in him.

1 John 2:3

Keeping God’s Commandments

2:3 Now ³  by this we know that we have come to know God: ⁴  if we keep his commandments.

1 John 4:17

4:17 By this ⁵  love is perfected with ⁶  us, so that we may have confidence in the day of judgment, because just as Jesus ⁷  is, so also are we in this world.

1 John 3:19

3:19 And by this ⁸  we will know that we are of the truth and will convince ⁹  our conscience ¹⁰  in his presence, ¹¹ 

1 John 2:4

2:4 The one who says “I have come to know God” ¹²  and yet does not keep his commandments is a liar, and the truth is not in such a person.

1 John 3:16

3:16 We have come to know love by this: ¹³  that Jesus ¹⁴  laid down ¹⁵  his life for us; thus we ought to lay down our lives for our fellow Christians.

1 John 4:2

4:2 By this ¹⁶  you know the Spirit of God: Every spirit that confesses ¹⁷  Jesus as the Christ ¹⁸  who has come in the flesh is from God,

1 John 4:13

4:13 By this ¹⁹  we know that we reside in God ²⁰  and he in us: in that he has given us of his Spirit. ²¹ 

1 John 5:2

5:2 By this ²²  we know that we love the children of God: whenever we love God and obey his commandments.

1 John 3:10

3:10 By this ²³  the children of God and the children of the devil are revealed: Everyone who does not practice righteousness – the one who does not love his fellow Christian ²⁴  – is not of God.

1 John 3:24

3:24 And the person who keeps his commandments resides ²⁵  in God, ²⁶  and God ²⁷  in him. Now by this ²⁸  we know that God ²⁹  resides in us: by the Spirit he has given us.

1 John 4:9-10

4:9 By this ³⁰  the love of God ³¹  is revealed in us: ³²  that God has sent his one and only ³³  Son into the world so that we may live through him. 4:10 In this ³⁴  is love: not that ³⁵  we have loved God, but that he loved us and sent his Son to be the atoning sacrifice ³⁶  for our sins.

[2:5]  ¹ tn The referent of this pronoun is probably to be understood as God, since God is the nearest previous antecedent.

[2:5]  ² tn Grk “in him.”

[2:3]  ³ tn The translation of καί (kai) at the beginning of 2:3 is important for understanding the argument, because a similar καί occurs at the beginning of 1:5. The use here is not just a simple continuative or connective use, but has more of a resumptive force, pointing back to the previous use in 1:5.

[2:3]  ⁴ tn Grk “know him.” (1) Many take the third person pronoun αὐτον (auton) to refer to Jesus Christ, since he is mentioned in 2:1 and the pronoun αὐτός (autos) at the beginning of 2:2 clearly refers to him. But (2) it is more likely that God is the referent here, since (a) the assurance the author is discussing here is assurance that one has come to know God (all the claims of the opponents in 1:5-2:11 concern knowing and having fellowship with the God who is light); (b) when Jesus Christ is explicitly mentioned as an example to follow in 1 John 2:6, the pronoun ἐκεῖνος (ekeinos) is used to distinguish this from previous references with αὐτός; (c) the καί (kai) which begins 2:3 is parallel to the καί which begins 1:5, suggesting that the author is now returning to the discussion of God who is light, a theme introduced in 1:5. The author will now discuss how a Christian may have assurance that he or she has come to know the God who is light.

[4:17]  ⁵ tn The referent of ἐν τούτῳ (en toutw) here is more difficult to determine than most, because while there are both ἵνα (Jina) and ὅτι (Joti) clauses following, it is not clear whether or not they are related to the ἐν τούτῳ. There are actually three possibilities for the referent of ἐν τούτῳ in 4:17: (1) it may refer to the ἵνα clause which immediately follows, so that the love of believers is brought to perfection in that they have confidence in the day of judgment. The main problem with this interpretation is that since the day of judgment is still future, it necessitates understanding the second use of the preposition “in” (second ἐν [en]) to mean “about” or “concerning” with reference to the day of judgment in order to make logical sense. (2) The ἐν τούτῳ may refer to the ὅτι clause in 4:17b, meaning “love is perfected with us…in that just as he [Christ] is, so also are we in this world.” This makes logical sense, and there are numerous cases where ἐν τούτῳ is explained by a ὅτι clause that follows. However, according to this understanding the intervening ἵνα clause is awkward, and there is no other instance of the phrase ἐν τούτῳ explained by a following ὅτι clause where a ἵνα clause intervenes between the two in this way. (3) Thus, the third possibility is that ἐν τούτῳ refers to what precedes in 4:16b, and this also would make logical sense: “By this – by our residing in love so that we reside in God and he resides in us – is love brought to perfection with us.” This has the additional advantage of agreeing precisely with what the author has already said in 4:12: “If we love one another, God remains in us and his love is brought to perfection in us.” Thus option (3) is best, with the phrase ἐν τούτῳ referring to what precedes in 4:16b, and the ἵνα clause which follows indicates the result of this perfection of love in believers: In the future day of judgment they will have confidence. The ὅτι clause would then give the reason for such confidence in the day of judgment: because just as Jesus is, so also are believers in this world – they are already currently in relationship with God just as Jesus is.

[4:17]  ⁶ tn The preposition μετά (meta) means “with” and modifies the verb τετελείωται (teteleiwtai). If the prepositional phrase modified the noun ἡ ἀγάπη which immediately precedes it, it would almost certainly have the Greek article, thus: ἡ ἀγάπη ἡ μεθ᾿ ἡμῶν (Jh agaph Jh meq’ Jhmwn).

[4:17]  ⁷ tn Grk “that one” (a reference to Jesus is indicated in the context). Once more the author uses the pronoun ἐκεῖνος (ekeinos) to refer to Jesus Christ, as he did in 2:6; 3:3, 5, 7, and 16. A reference to Christ is confirmed in this context because the author says that “just as he is, so also are we [believers] in this world” and since 3:2 indicated that believers are to be like God in the future (but are not yet), the only one believers can be like already in the present age is Jesus Christ.

[3:19]  ⁷ tn Once again there is the problem of deciding whether the phrase ἐν τούτῳ (en toutw) refers (1) to what precedes or (2) to what follows. When an explanatory or epexegetical ὅτι (Joti) clause follows, and the ὅτι clause is not grammatically unrelated to the phrase ἐν τούτῳ, then the ἐν τούτῳ is best understood as referring to what follows. Here in 3:19-20 there are no less than three ὅτι clauses that follow, one in 3:19 and two in 3:20, and thus there is the difficulty of trying to determine whether any one of them is related to the ἐν τούτῳ phrase in 3:19. It is relatively easy to eliminate the first ὅτι clause (in 3:19) from consideration, because it is related not to ἐν τούτῳ but to the verb γνωσόμεθα (gnwsomeqa) as an indirect discourse clause giving the content of what believers know (“that we are of the truth”). As far as the two ὅτι clauses in 3:20 are concerned, it is difficult to see how believers could know that they belong to the truth (19a) by means of either, since the first speaks of a situation where they are under self-condemnation (“if our heart condemns us…”) and the second ὅτι clause seems to give a further explanation related to the first (“that God is greater than our heart…”). Therefore it seems better to understand the phrase ἐν τούτῳ in 3:19 as referring to the preceding context, and this makes perfectly good sense, because 3:18 concludes with a reference to the righteous deeds with which believers are to love one another, which are produced by the truth.

[3:19]  ⁸ tn The verb πείθω (peiqw) in the active voice (with the exception of the second perfect and pluperfect) means (a) “to convince”; (b) “to persuade, appeal to”; (c) “to win over, strive to please”; or (d) “to conciliate, pacify, set at ease or rest” (see BDAG 791 s.v. πείθω). Interpreters are generally divided between meaning (a) and meaning (d) for the verb in the present context, with BDAG opting for the latter (although it is pointed out that “the text is not in good order”). In any case the object of the verb πείθω in this context is καρδία (kardia), and this leads to further problems because the meaning of καρδία will affect one’s understanding of πείσομεν (peisomen) here.

[3:19]  ⁹ tn Further difficulties are created by the meaning of καρδία (kardia) in 3:19. Although it may be agreed that the term generally refers to the “center and source of the whole inner life, w. its thinking, feeling, and volition” (BDAG 508 s.v. l.b), this may be further subdivided into references to (a) “the faculty of thought…as the organ of natural and spiritual enlightenment,” that is, the mind; (b) “the will and its decisions”; (c) “the emotions, wishes, desires,” i.e., the emotions or feelings; or (d) “moral decisions, the moral life,” that is, the part of the individual where moral decisions are made, which is commonly called the conscience. Thus καρδία in 3:19 could refer to either the mind, the will, the emotions, or the conscience, and it is not transparently clear which concept the author has primarily in view. In light of the overall context, which seems to discuss the believer’s assurance of his or her standing before God (ἔμπροσθεν αὐτοῦ [emprosqen autou] in 3:19 and the mention of παρρησία [parrhsia, “boldness” or “confidence”] in 3:21) it seems probable that the conscience, that aspect of one’s καρδία which involves moral choices and the guilt or approval for having made them, is primarily in view here. Thus the meaning “convince” is preferred for the verb πείθω (peiqw), since the overall subject seems to be the believer’s assurance of his or her standing before God, especially in the case when (v. 20) the believer’s conscience attempts to condemn him on account of sin.

[3:19]  ¹⁰ tn Both ἔμπροσθεν (emprosqen) in 3:19 and ἐνώπιον (enwpion) in 3:22 are improper prepositions and both express the meaning “before” in the sense of “in the presence of.” (1) Some interpreters have tried to see a subtle distinction in meaning between the two in 3:19 and 22, but (2) as BDF §214.6 points out, ἔμπροσθεν and ἐνώπιον, along with a third classical expression ἐναντίον (enantion), all refer to being in someone’s presence and are essentially interchangeable. There can be little doubt that once more the author’s fondness for stylistic variation in terminology is at work here.

[2:4]  ⁹ tn Grk “know him.” See the note on the phrase “know God” in 1 John 2:3 for explanation.

[3:16]  ¹¹ tn Here the phrase ἐν τούτῳ (en toutw) is followed by a ὅτι (Joti) clause which is epexegetical (or explanatory), and thus ἐν τούτῳ refers to what follows.

[3:16]  ¹² tn Grk “that one.” Context indicates a reference to Jesus. The mention of the sacrificial death in 3:16 (ὑπὲρ ἡμῶν τὴν ψυχὴν αὐτοῦ ἔθηκεν, Juper hmwn thn yuchn autou eqhken) points to Jesus as the referent here. (This provides further confirmation that ἐκεῖνος [ekeinos] in 2:6; 3:3, 5, and 7 refers to Jesus.)

[3:16]  ¹³ sn References to the fact that Jesus laid down his life using the verb τίθημι (tiqhmi) are unique to the Gospel of John (10:11, 15, 17, 18; 13:37, 38; 15:13) and 1 John (only here). From John’s perspective Jesus’ act in giving up his life sacrificially was a voluntary one; Jesus was always completely in control of the situation surrounding his arrest, trials, and crucifixion (see John 10:18). There is a parallel with 1 John 2:6 – there, as here, the life of Jesus (during his earthly ministry) becomes the example for believers to follow. This in turn underscores the importance of Jesus’ earthly life and ministry (especially his sacrificial death on the cross), a point of contention between the author and his opponents in 1 John. See 1 John 4:10 for a further parallel.

[4:2]  ¹³ tn There is no subordinating conjunction following the ἐν τούτῳ (en toutw) here in 4:2, so the phrase could refer either (1) to what precedes or (2) to what follows. Contextually the phrase refers to what follows, because the following clause in 4:2b-3a (πᾶν πνεῦμα ὃ ὁμολογεῖ ᾿Ιησοῦν Χριστὸν…ἐκ τοῦ θεοῦ ἐστιν, καὶ πᾶν πνεῦμα ὃ μὴ ὁμολογεῖ τὸν ᾿Ιησοῦν ἐκ τοῦ θεοῦ οὐκ ἔστιν), while not introduced by a subordinating conjunction, does explain the preceding clause beginning with ἐν τούτῳ. In other words, the following clause in 4:2b-3a is analogous to a subordinate clause introduced by an epexegetical ἵνα (Jina) or ὅτι (Joti), and the relationship can be represented in the English translation by a colon, “By this you know the Spirit of God: Every Spirit that confesses Jesus as the Christ who has come in the flesh is from God, but every Spirit that does not confess Jesus is not from God.”

[4:2]  ¹⁴ tn Or “acknowledges.”

[4:2]  ¹⁵ tn This forms part of the author’s christological confession which serves as a test of the spirits. Many interpreters have speculated that the author of 1 John is here correcting or adapting a slogan of the secessionist opponents, but there is no concrete evidence for this in the text. Such a possibility is mere conjecture (see R. E. Brown, Epistles of John [AB], 492). The phrase may be understood in a number of different ways, however: (1) the entire phrase “Jesus Christ come in the flesh” may be considered the single object of the verb ὁμολογεῖ (Jomologei; so B. F. Westcott, A. Brooke, J. Bonsirven, R. E. Brown, S. Smalley, and others); (2) the verb ὁμολογεῖ may be followed by a double accusative, so that both “Jesus Christ” and “come in the flesh” are objects of the verb; the meaning would be “confess Jesus Christ as come in the flesh” (so B. Weiss, J. Chaine, and others). (3) Another possibility is to see the verb as followed by a double accusative as in (2), but in this case the first object is “Jesus” and the second is “the Christ come in the flesh,” so that what is being confessed is “Jesus as the Christ come in the flesh” (so N. Alexander, J. Stott, J. Houlden, and others). All three options are grammatically possible, although not equally probable. Option (1) has a number of points in its favor: (a) the parallel in 2 John 7 suggests to some that the phrase should be understood as a single object; (b) option (2) makes “Jesus Christ” the name of the preincarnate second Person of the Trinity, and this would be the only place in the Johannine literature where such a designation for the preincarnate Λόγος (Logos) occurs; and (c) option (3) would have been much clearer if Χριστόν (Criston) were accompanied by the article (ὁμολογεῖ ᾿Ιησοῦν τὸν Χριστόν, Jomologei Ihsoun ton Criston). Nevertheless option (3) is preferred on the basis of the overall context involving the secessionist opponents: Their christological views would allow the confession of the Christ come in the flesh (perhaps in the sense of the Spirit indwelling believers, although this is hard to prove), but they would have trouble confessing that Jesus was (exclusively) the Christ incarnate. The author’s failure to repeat the qualifying phrases (Χριστὸν ἐν σαρκὶ ἐληλυθότα, Criston en sarki elhluqota) in the negative repetition in 4:3a actually suggests that the stress is on Jesus as the confession the opponents could not or would not make. It is difficult to see how the parallel in 2 John 7 favors option (1), although R. E. Brown (Epistles of John [AB], 492) thinks it does. The related or parallel construction in John 9:22 (ἐάν τις αὐτὸν ὁμολογήσῃ Χριστόν, ean ti" auton Jomologhsh Criston) provides further support for option (3). This is discounted by R. E. Brown because the verb in John 9:22 occurs between the two accusative objects rather than preceding both as here (Epistles of John [AB], 493 – although Brown does mention Rom 10:9 as another parallel closer in grammatical structure to 1 John 4:2). Brown does not mention the textual variants in John 9:22, however: Both Ì⁶⁶ and Ì⁷⁵ (along with K, ˹³ and others) read ὁμολογήσῃ αὐτὸν Χριστόν (Jomologhsh auton Criston). This structure exactly parallels 1 John 4:2, and a case can be made that this is actually the preferred reading in John 9:22; furthermore, it is clear from the context in John 9:22 that Χριστόν is the complement (what is predicated of the first accusative) since the object (the first accusative) is αὐτόν rather than the proper name ᾿Ιησοῦν. The parallel in John 9:22 thus appears to be clearer than either 1 John 4:2 or 2 John 7, and thus to prove useful in understanding both the latter constructions.

[4:13]  ¹⁵ tn Again whether the referent of the phrase ἐν τούτῳ (en toutw) (1) precedes or (2) follows is a problem. This time there are two ὅτι (Joti) clauses which follow. The first is an indirect discourse clause related to γινώσκομεν (ginwskomen) and giving the content of what believers know: “that we reside in him and he in us.” The second ὅτι clause is epexegetical (or explanatory) to the ἐν τούτῳ phrase, explaining how believers know that they reside in God and God remains in them: “in that he has given us of his Spirit.”

[4:13]  ¹⁶ tn Grk “in him.” Context indicates that the pronoun refers to God (see 4:12).

[4:13]  ¹⁷ sn The genitive of his Spirit here, like the phrase in 3:24, probably reflects a partitive nuance, so that the author portrays God as ‘apportioning’ his Spirit to individual believers. This leads to the important observation that the author is not particularly interested in emphasizing (1) the ongoing interior witness of the Holy Spirit (which is what the passage is often understood to mean) but is emphasizing (2) the fact that God has given the Spirit to believers, and it is this fact that gives believers assurance of their relationship to God. In other words, it is the fact that the Holy Spirit has been given to believers, rather than the ongoing interior testimony of the Holy Spirit within the believer, which is the primary source of the believer’s assurance.

[5:2]  ¹⁷ tn Once more there is the familiar difficulty of determining whether the phrase refers (1) to what precedes or (2) to what follows. Here, because ἐν τούτῳ (en toutw) is followed by a clause introduced by ὅταν (Jotan) which appears to be related, it is best to understand ἐν τούτῳ as referring to what follows. The following ὅταν clause is epexegetical to ἐν τούτῳ, explaining how we know that we love God’s children: “by this we know that we love God’s children, whenever we love God and keep his commandments.”

[3:10]  ¹⁹ tn Once again there is the problem (by now familiar to the interpreter of 1 John) of determining whether the phrase ἐν τούτῳ (en toutw) in 3:10 refers (1) to what precedes or (2) to what follows. If it refers to what precedes, it serves to conclude the unit which began with 2:28. The remainder of 3:10 would then form a transition to the following material (another “hinge” passage). On the other hand, if the phrase ἐν τούτῳ refers to what follows, then the entirety of 3:10 is a summary statement at the end of 2:28-3:10 which recapitulates the section’s major theme (conduct is the clue to paternity), and provides at the same time a transition to the theme of loving one’s brother which will dominate the following section (3:11-24). Although R. E. Brown (Epistles of John [AB], 416) prefers to see the phrase as referring to the preceding material, it makes better sense to refer it to the remainder of 3:10 that follows, and see the entirety of 3:10 as both a summary of the theme of the preceding section 2:28-3:10 and a transition to the following section 3:11-24.

[3:10]  ²⁰ tn See note on the term “fellow Christian” in 2:9.

[3:24]  ²¹ tn The verb μένω (menw) has been translated “resides” here because this verse refers to the mutual and reciprocal relationship between God and the believer.

[3:24]  ²² tn Grk “in him.” In context this is almost certainly a reference to God (note the phrase “his Son Jesus Christ” in 3:23).

[3:24]  ²³ tn Grk “he.” In context this is almost certainly a reference to God (note the phrase “his Son Jesus Christ” in 3:23).

[3:24]  ²⁴ tn Once again there is the (by now familiar) question of whether the phrase ἐν τούτῳ (en toutw) refers to what precedes or to what follows. In this case, the following phrase ἐκ τοῦ πνεύματος (ek tou pneumato") explains the ἐν τούτῳ phrase, and so it refers to what follows.

[3:24]  ²⁵ tn Grk “he.” In context this is almost certainly a reference to God (note the phrase “his Son Jesus Christ” in 3:23).

[4:9]  ²³ tn Once again there is the problem of determining whether the phrase ἐν τούτῳ (en toutw) refers (1) to what precedes or (2) to what follows. This is the first of 5 uses of the phrase in the present section (4:9, 10, 13, 17; 5:2). In this case (as also in the next two instances) there is a ὅτι (Joti) clause following which is related and which explains (i.e., which is epexegetical to) the phrase ἐν τούτῳ. Thus the meaning here is, “By this the love of God is revealed in us: that God has sent his only Son into the world in order that we might live through him.”

[4:9]  ²⁴ tn In terms of syntax the force of the genitive τοῦ θεοῦ (tou qeou) may be (1) objective, (2) subjective, or (3) both. The phrase occurs for the first time in the letter in 2:5. Here in 4:9 the epexegetical ὅτι (Joti) clause which follows makes it clear that this is a subjective genitive, emphasizing God’s love for us rather than our love for God, because it describes God’s action in sending his Son into the world.

[4:9]  ²⁵ tn This phrase is best understood as the equivalent of a dative of sphere, but this description does not specify where the love of God is revealed with regard to believers: “in our midst” (i.e., among us) or “within us” (i.e., internally within believers). The latter is probable, because in the context the concept of God’s indwelling of the believer is mentioned in 4:12: “God resides (μένει, menei) in us.”

[4:9]  ²⁶ sn Although the word translated one and only (μονογενής, monogenhs) is often rendered “only begotten,” such a translation is misleading, since in English it appears to express a metaphysical relationship. The word in Greek was used of an only child (a son [Luke 7:12, 9:38] or a daughter [Luke 8:42]). It was also used of something unique (only one of its kind) such as the mythological bird called the Phoenix (1 Clement 25:2). From here it passes easily to a description of Isaac (Heb 11:17 and Josephus, Ant. 1.13.1 [1.222]) who was not Abraham’s only son, but was one-of-a-kind because he was the child of the promise. Thus the word means “one-of-a-kind” and is reserved for Jesus alone in the Johannine literature of the NT. While all Christians are children of God (τέκνα θεοῦ, tekna qeou), Jesus is God’s Son in a unique, one-of-a-kind sense. The word is used in this way in all its uses in the Gospel of John (1:14, 18; 3:16, 18).

[4:10]  ²⁵ tn Once again there is the (by now familiar) problem of determining whether the referent of this phrase (1) precedes or (2) follows. Here there are two ὅτι (Joti) clauses which follow, both of which are epexegetical to the phrase ἐν τούτῳ (en toutw) and explain what the love of God consists of: first, stated negatively, “not that we have loved God,” and then positively, “but that he loved us and sent his Son to be the atoning sacrifice for our sins.”

[4:10]  ²⁶ tn The two ὅτι (Joti) clauses are epexegetical to the phrase ἐν τούτῳ (en toutw) which begins the verse.

[4:10]  ²⁷ sn As explained at 2:2, inherent in the meaning of the word translated atoning sacrifice (ἱλασμός, Jilasmos) is the idea of turning away the divine wrath, so that “propitiation” is the closest English equivalent. God’s love for us is expressed in his sending his Son to be the propitiation (the propitiatory sacrifice) for our sins on the cross. This is an indirect way for the author to allude to one of the main points of his controversy with the opponents: the significance for believers’ salvation of Jesus’ earthly life and ministry, including especially his sacrificial death on the cross. The contemporary English “atoning sacrifice” communicates this idea more effectively.