¹ tn Or “purifies.”

² tn BDAG 50 s.v. ἁμαρτία 1 defines this term as “a departure fr. either human or divine standards of uprightness” (see 1 John 5:17 where ἁμαρτία [Jamartia] and ἀδικία [adikia] are related). This word occurs 17 times in 1 John, of which 11 are singular and 6 are plural.

sn From all sin. Sometimes a distinction between singular “sin” and plural “sins” has been suggested: Some would see the singular all sin of 1:7 as a reference to sinfulness before conversion and the plural sins of 1:9 as a reference to sins committed after one became a Christian. This amounts to making 1:7 refer to initial justification and 1:9 to sanctification. But the phrase all sin in 1:7 is so comprehensive that it can hardly be limited to preconversion sins, and the emphasis on “walking” in 1:7 strongly suggests that the Christian life is in view (not one’s life before conversion). In 1 John 1:8 sin appears as a condition or characteristic quality, which in 1:10 is regarded as universal. Apart from forgiveness in Christ it results in alienation from God (2:15) and spiritual death (3:14). But according to 1 John 1:7, cleansing from sin is possible by the blood (representing the sacrificial death) of Jesus.

³ tn The genitive βίου (biou) is difficult to translate: (1) Many understand it as objective, so that βίος (bios, “material life”) becomes the object of one’s ἀλαζονεία (alazoneia; “pride” or “boastfulness”). Various interpretations along these lines refer to boasting about one’s wealth, showing off one’s possessions, boasting of one’s social status or lifestyle. (2) It is also possible to understand the genitive as subjective, however, in which case the βίος itself produces the ἀλαζονεία. In this case, the material security of one’s life and possessions produces a boastful overconfidence. This understanding better fits the context here: The focus is on people who operate purely on a human level and have no spiritual dimension to their existence. This is the person who loves the world, whose affections are all centered on the world, who has no love for God or spiritual things (“the love of the Father is not in him,” 2:15).

sn The arrogance produced by material possessions. The person who thinks he has enough wealth and property to protect himself and insure his security has no need for God (or anything outside himself).