5. But he who keeps (treasures) His Word [who bears in mind His precepts, who observes His message in its entirety], truly in him has the love of and for God been perfected (completed, reached maturity). By this we may perceive (know, recognize, and be sure) that we are in Him:
6. Whoever says he abides in Him ought [as a personal debt] to walk and conduct himself in the same way in which He walked and conducted Himself.
7. Beloved, I am writing you no new commandment, but an old commandment which you have had from the beginning; the old commandment is the message which you have heard [the doctrine of salvation through Christ].
8. Yet I am writing you a new commandment, which is true (is realized) in Him and in you, because the darkness (moral blindness) is clearing away and the true Light (the revelation of God in Christ) is already shining.
9. Whoever says he is in the Light and [yet] hates his brother [Christian, born-again child of God his Father] is in darkness even until now.
10. Whoever loves his brother [believer] abides (lives) in the Light, and in It or in him there is no occasion for stumbling or cause for error or sin.
11. But he who hates (detests, despises) his brother [in Christ] is in darkness and walking (living) in the dark; he is straying and does not perceive or know where he is going, because the darkness has blinded his eyes.
12. I am writing to you, little children, because for His name's sake your sins are forgiven [pardoned through His name and on account of confessing His name].
13. I am writing to you, fathers, because you have come to know (recognize, be aware of, and understand) Him Who [has existed] from the beginning. I am writing to you, young men, because you have been victorious over the wicked [one]. I write to you, boys (lads), because you have come to know (recognize and be aware) of the Father.