this is what John says in 1John2: let’s use a little color coding. The Green is what Evangelical’s / protestants focus on. the Red is the rest of the story. Catholic Theology includes both parts,
1 My children, I am writing this to you so that you may not commit sin. But if anyone does sin, we have an Advocate with the Father, Jesus Christ the righteous one.
2 He is expiation for our sins, and not for our sins only but for those of the whole world. 3 The way we may be sure that we know him is to keep his command ments.
4Whoever says, “I know him,” but does not keep his commandments is a liar, and the truth is not in him.
5 But whoever keeps his word, the love of God is truly perfected in him. This is the way we may know that we are in union with him:
6 whoever claims to abide in him ought to live (just) as he lived.
7 Beloved, I am writing no new commandment to you but an old commandment that you had from the beginning. The old commandment is the word that you have heard.
8 And yet I do write a new commandment to you, which holds true in him and among you, for the darkness is passing away, and the true light is already shining.
and does not know where he is going because the darkness has blinded his eyes.
12 I am writing to you, children, because your sins have been forgiven for his name’s sake.
13 I am writing to you, fathers, because you know him who is from the beginning. I am writing to you, young men, because you have conquered the evil one.
14 I write to you, children, because you know the Father. I write to you, fathers, because you know him who is from the beginning. I write to you, young men, because you are strong and the word of God remains in you, and you have conquered the evil one.
15 Do not love the world or the things of the world. If anyone loves the world, the love of the Father is not in him.
16 For all that is in the world, sensual lust, 8 enticement for the eyes, and a pretentious life, is not from the Father but is from the world.
17 Yet the world and its enticement are passing away. But whoever does the will of God remains forever.
18 Children, it is the last hour; and just as you heard that the antichrist was coming, so now many antichrists have appeared. Thus we know this is the last hour.
19 They went out from us, but they were not really of our number; if they had been, they would have remained with us. Their desertion shows that none of them was of our number.
20 But you have the anointing that comes from the holy one, and you all have knowledge. 21 I write to you not because you do not know the truth but because you do, and because every lie is alien to the truth.
22 Who is the liar? Whoever denies that Jesus is the Christ. Whoever denies the Father and the Son, this is the antichrist.
23 No one who denies the Son has the Father, but whoever confesses the Son has the Father as well. 24 Let what you heard from the beginning remain in you. If what you heard from the beginning remains in you, then you will remain in the Son and in the Father. 25 And this is the promise that he made us: eternal life. 26 I write you these things about those who would deceive you.
27 As for you, the anointing that you received from him remains in you, so that you do not need anyone to teach you. But his anointing teaches you about everything and is true and not false; just as it taught you, remain in him.
28 And now, children, remain in him, so that when he appears we may have confidence and not be put to shame by him at his coming.
29 If you consider that he is righteous, you also know that everyone who acts in righteousness is begotten by him.
Notice the red lines, which are generally not understood by Protestants include refutations of sola Fide: You must not commit sin and you must keep the commandments and do the will of God.
It condemns those that have left the church as being unannointed.
It also condemns the concept of OSAS, calling on us to remain in Christ
Paul, the two commandments given by the Lord are the summary of the OT law which how many were able to keep? Zero, nothing has changed in that regard, which is why we need a Savior and why God sent us a Savior to save of from what? Sin, and lawlessness is sin. Why do we need and advocate? To help us against the accusations of the evil one and why is there but one intersessor between man and God? Because God purposed it that way.
"Now to the one who works, his wage is not reckoned as a grace, but as what is due. But to the one who does not work, but believes in Him who justifies the ungodly, his faith is reckoned as righteousness" ------ Rom. 4:4-5 Sola Fide
The same mistake the nation of Israel made in abandoning Soal Fide
"For not knowing about God’s righteousness, and seeking to establish their own, they did not subject themselves to the righteousness of God" ------- Romans 10:3
What about Jesus?
“Your faith has made you well” Matt. 9:22; Mk. 5:34; 10:52; Lk. 8:48; 17:19; 18:42. These are all object lessons on the doctrine of justification by faith alone.
Whenever and wherever justification is fused or intertwined with sanctification, then righteousness by works become an essential part of the salvation process. Faith is thus debased with works & is no longer genuine by His standard. This was the error Paul addressed with the legalists in Galatia (Gal. 2:16; 5:4) Paul called it “a different gospel” Gal. 1:6, 9. Anything that Paul calls a different gospel is not a good thing!