But, if we live in the light [of righteousness] just like God [constantly] lives in the light [of righteousness], we can truly share a relationship with one another and [can know that] the blood of Jesus, God's Son, continues to cleanse [our spirits] from all of our sins.

he who says he remains in him ought himself also to walk just like he walked.

If you know that He is absolutely righteous, you know [for certain] that everyone who practices righteousness [doing what is right and conforming to God’s will] has been born of Him.

Look at how great a love the Father has given us that we should be called God’s children. And we are! The reason the world does not know us is that it didn’t know Him.

Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.

And every person who has set his hope on this [i.e., of being like Jesus], will live [as] purely [as possible], just as He [i.e., Jesus Himself] is pure.

No one who has been [spiritually] conceived [and eventually born] by God continues to live a sinful life, because God's seed [i.e., His word, See Luke 8:11] continues to live in his heart, so he cannot [continue a life of] sin, because he has been conceived by God.

and not be like Cain, who was of the evil one and murdered his brother [Abel]. And why did he murder him? Because Cain’s deeds were evil, and his brother’s were righteous.

This is how love has been perfected among us: we will have confidence on the day of judgment because, during our time in this world, we are just like him.