1-4: Everyone who believes Jesus is the Christ is born of God, and
everyone who loves the parent loves the child. The way for us to
know that we love the children of God is if we love God and obey
His commandments This is love of God, namely, keeping the
commandments. And His commandments are not heavy. For every one
who is born of God conquers the world -- the one born of God
cannot sin-- and this is the victory that conquers the world: our
faith. - Faith includes obedience, and obedience to God is the
same as love of God. Please cf. also comments above on 1:5.

5-12: Who is the one that conquers the world but the one who
believes that Jesus is the Son of God. He is the one who came
through water and blood, Jesus Christ, not in water alone, but in
water and in blood -- the reference is to the water of baptism and
the blood which flowed from His side. The Spirit who is truth,
testifies to the truth of this. Then vv. 7-8 add: "There are three
who give witness: the Spirit and the water and the blood. And
these three are one." The Biblical Commission at first strongly
discouraged denying these words, "the Johanine Comma" were by the
author of 1 John, but later it admitted scholars may continue to
discuss the question of authorship--it has always been clear that
these words are part of inspired Scripture.

If we accept the testimony of men, the testimony of God is
greater. And this is that testimony: He has testified to His Son.
One who believes in the Son of God has this testimony in himself.
The one who does not believe makes God a liar by not believing
what God has testified about His Son. And the testimony is this:
that God gave eternal life to us, and this eternal life is in His
Son. Whoever has the Son has eternal life. The one who does not
have the Son of God does not have life.

13-15: I have written these things to you so you may know that you
have eternal life, you who believe in the name of the Son of God.
And this is the confidence we have towards Him, that whatever we
ask according to His will, He hears us. And if we know that He
hears us in whatever we ask we know that we have obtained the
requests that we have made of Him.

16-17: If anyone sees his brother committing a sin that does is
not finally death-bringing, he will ask and life will be given
him, to the one who does not commit sins that are finally death-
bringing. There is a sin that is finally death-bringing. I do not
say that one should pray for that one. All violation of the law is
sin, but there is also a sin that is not finally death-bringing.

The lack of precise terms here is a problem. John does not mean of
course that there is no use in praying for someone who commits
mortal sin - it is the sin that is going to <finally> bring
spiritual death, i.e., the sin of final impenitence, or such
hardening that it is hardly possible for the sinner to repent.

We know that everyone who is born of God does not sin. The One who
is born of God (Jesus) keeps the man and the evil one does not
touch him. We know that we are of God, and the whole world lies
under the evil one. And we know that the Son of God has come and
has given us understanding so as to know Him who is true. And we
are in Him who is true, in His Son Jesus Christ. He is the true
God and eternal life.

Little children, keep yourself from idols.