Commentaries:
Robertson's Word Pictures (NT)
I know him (Egnwka auton). Perfect active indicative with recitative oti like quotation marks just before it. This is one of the pious platitudes, cheap claptrap of the Gnostics, who would bob up in meetings with such explosions. John punctures such bubbles with the sharp addition "and keepeth not" (o mh thrwn, present active linear participle). "The one who keeps on saying: 'I have come to know him,' and keeps on not keeping his commandments is a liar" (yeusthv, just like Satan, John 8:44 and like I John 1:8, I John 1:10), followed by the negative statement as in I John 1:8, I John 1:10. There is a whip-cracker effect in John's words.
Other Robertson's Word Pictures (NT) entries containing 1 John 2:4:
John 8:55
Philippians 3:18
1 John 2:22
1 John 4:20
3 John 1:7
Revelation 1:3
Revelation 3:9
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