1. SEE WHAT [an incredible] quality of love the Father has given (shown, bestowed on) us, that we should [be permitted to] be named and called and counted the children of God! And so we are! The reason that the world does not know (recognize, acknowledge) us is that it does not know (recognize, acknowledge) Him.
2. Beloved, we are [even here and] now God's children; it is not yet disclosed (made clear) what we shall be [hereafter], but we know that when He comes and is manifested, we shall [as God's children] resemble and be like Him, for we shall see Him just as He [really] is.
3. And everyone who has this hope [resting] on Him cleanses (purifies) himself just as He is pure (chaste, undefiled, guiltless).
4. Everyone who commits (practices) sin is guilty of lawlessness; for [that is what] sin is, lawlessness (the breaking, violating of God's law by transgression or neglect–being unrestrained and unregulated by His commands and His will).
5. You know that He appeared in visible form and became Man to take away [upon Himself] sins, and in Him there is no sin [essentially and forever].
6. No one who abides in Him [who lives and remains in communion with and in obedience to Him–deliberately, knowingly, and habitually] commits (practices) sin. No one who [habitually] sins has either seen or known Him [recognized, perceived, or understood Him, or has had an experiential acquaintance with Him].
7. Boys (lads), let no one deceive and lead you astray. He who practices righteousness [who is upright, conforming to the divine will in purpose, thought, and action, living a consistently conscientious life] is righteous, even as He is righteous.
8. [But] he who commits sin [who practices evildoing] is of the devil [takes his character from the evil one], for the devil has sinned (violated the divine law) from the beginning. The reason the Son of God was made manifest (visible) was to undo (destroy, loosen, and dissolve) the works the devil [has done].
9. No one born (begotten) of God [deliberately, knowingly, and habitually] practices sin, for God's nature abides in him [His principle of life, the divine sperm, remains permanently within him]; and he cannot practice sinning because he is born (begotten) of God.
10. By this it is made clear who take their nature from God and are His children and who take their nature from the devil and are his children: no one who does not practice righteousness [who does not conform to God's will in purpose, thought, and action] is of God; neither is anyone who does not love his brother (his fellow believer in Christ).
11. For this is the message (the announcement) which you have heard from the first, that we should love one another,
12. [And] not be like Cain who [took his nature and got his motivation] from the evil one and slew his brother. And why did he slay him? Because his deeds (activities, works) were wicked and malicious and his brother's were righteous (virtuous).
13. Do not be surprised and wonder, brethren, that the world detests and pursues you with hatred.
14. We know that we have passed over out of death into Life by the fact that we love the brethren (our fellow Christians). He who does not love abides (remains, is held and kept continually) in [spiritual] death.
15. Anyone who hates (abominates, detests) his brother [in Christ] is [at heart] a murderer, and you know that no murderer has eternal life abiding (persevering) within him.
16. By this we come to know (progressively to recognize, to perceive, to understand) the [essential] love: that He laid down His [own] life for us; and we ought to lay [our] lives down for [those who are our] brothers [in Him].