Cyrus Ingerson Scofield

“ First John is a family letter from the Father to His "little children" who are in the world. With the possible exception of the Song, it is the most intimate of the inspired writings. The world is viewed as without. The sin of a believer is treated as a child's offence against his Father, and is dealt with as a family matter (1 John 1:9; 2:1) . The moral government of the universe is not in question. The child's sin as an offence against the law had been met in the Cross, and "Jesus Christ the righteous" is now his "Advocate with the Father." ”

“ Verse 28 little children
The general term for all children.
CHAPTER 3
Verse 1 world
kosmos = mankind. (See Scofield "Matthew 4:8") .
Verse 4 committeth sin practiseth sin practiseth also lawlessness; and sin is lawlessness.
sin Sin. (See Scofield "Romans 3:23")
Verse 7 righteousness
"Righteousness" here, and in the passages having marginal references to this, means the righteous life which is the result of salvation through Christ. The righteous man under law became righteous by doing righteously; under grace he does righteously because he has been made righteous Romans 3:22. ”

“ The little children and fellowship1:3-2:14 The little children and secular and "religious" world2:15-28. How the little children may know each other, 2:29-3:10 How the little children must live together, 3:11-24. Parenthetic: How the little children may know false teachers, 4:1-6. ”