Commentaries
1:5-11 Whatever tends to weaken love to God, or love to the brethren, tends to defeat the end of the commandment. The design of the gospel is answered, when sinners, through repentance towards God and faith in Jesus Christ, are brought to exercise Christian love. And as believers were righteous persons in God's appointed way, the law was not against them. But unless we are made righteous by faith in Christ, really repenting and forsaking sin, we are yet under the curse of the law, even according to the gospel of the blessed God, and are unfit to share the holy happiness of heaven.
6. From which—namely, from a pure heart, good conscience, and faith unfeigned, the well-spring of love.
having swerved—literally, "having missed the mark (the 'end') to be aimed at." It is translated, "erred," 1Ti 6:21; 2Ti 2:18. Instead of aiming at and attaining the graces above named, they "have turned aside (1Ti 5:15; 2Ti 4:4; Heb 12:13) unto vain jangling"; literally, "vain talk," about the law and genealogies of angels (1Ti 1:7; Tit 3:9; 1:10); 1Ti 6:20, "vain babblings and oppositions." It is the greatest vanity when divine things are not truthfully discussed (Ro 1:21) [Bengel].