1 John 2:27-29 - Let what you heard abide in you

The key - What you have heard from beginning,
Keep doing it - (then) You will abide with Son and Father
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Vs. 2:27 – As for you, the anointing which you received from Him abides in you, and you have no need for anyone to teach you; but as His anointing teaches you about all things, and is true and is not a lie, and just as it has taught you, you abide in Him -

But as for you…remember there are those trying to trick you into moving away from Jesus – but it won’t happen. Why? You have been given the Holy Spirit that Jesus promised (see John 14:16, 26). Since you have the Holy Spirit, you don’t need to worry about being led into falsehoods, false teachings, away from Christ, because the Holy Spirit will only teach you the truth. But there is a catch: now that you have the Holy Spirit, you must ‘keep’ him.
This verse is very specific: You have the truth because you have the Holy Spirit, but to remain in the truth you need to remain in a relationship with the Holy Spirit. “Abide” is the word used – it basically means to remain in place, to sojourn, to not depart, to be held, kept, continually, to remain as one, not to become different. I heard somewhere, that the word picture is ‘making a home’, or ‘making a nest’. This not a casual relationship, but a inter-connection between you and the Holy Spirit, and God. Teaching and knowing the truth is not happenstance, peripheral, but requires time spent. Each day we learn how to live with the Holy Spirit in charge.

BUT…you have the Holy Spirit Anointing.. Anointing teaches You Abide in Him

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Have You Made the Wonderful Discovery of the Spirit-Filled Life?

Do you have a relationship with the Holy Spirit? If not, you are missing a vital, necessary part of living the Christian life. The Holy Spirit is promised to us by Jesus to be our helper, our teacher, our guide through our life on earth. Here is a good place to start learning how to have a growing, vibrant relationship with the Holy Spirit.
The following link, Have You Made the Wonderful Discovery of the Spirit-Filled Life? will lead you step-by-step to living an empowered Spirit-filled life. (Link opens in new window)
This is from CRU.org (formerly Campus Crusade for Christ), and I can say it has had a huge impact on my life. I first heard this at 'Explo 72' in Dallas, TX. There, for the first time I learned about living moment-by-moment in the power of the Holy Spirit.

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Vs. 2:28 - Now, little children, abide in Him, so that when He appears, we may have confidence and not shrink away from Him in shame at His coming –

Christ is coming again, and when He appears – are you ready? Can you face the judgement? We know the believers will not face the final ‘Great White Throne’ judgement. Our names are in the Lamb’s book of life. But we will face the judgement of Christ. (See 1 Cor 3:10-15; 2 Cor 5:10). We must lead a life that is worthy of our calling (Col 1:10-14) Offer ourselves as living sacrifices (Rom 12:1-2). The only way we can live as we ought is to have Christ living through us.(Gal. 3:20)

Abide in Him = confidence, no shame

If we remain in the living by faith mode, then there is no worry about what we face. There is no need for shame on our part. If we remain in living faithfully, we can be confident. No need to panic.

We can KNOW. But... When we sin, we are not lost!

We can know, we won’t be deceived by our own selves, or by others. This is true because we have the Holy Spirit. We have been “anointed” by the Holy Spirit. But requires effort – we must ‘abide’ – make our home with Christ. Abiding gives confidence. So that you are not afraid to answer for your life when He returns. Even believers face a judgment (See 2 Cor. 5:10, 1 Cor 3:10-15). Being saved, our names are forever written in the Lamb’s book of life (Phil 4:3; Rev. 3:5, 13, 18; 17:8; 20:12, 15; 21:27), is the first (and most important) step. Christianity does not stop there.
James puts it bluntly: ‘faith w/o works is dead’, James 4:14-26. But Paul also indicates this – Col 1:10; Tit 3:8. I especially like the way Colossians states it, “in a manner worthy…” At the end of the movie “Saving Private Ryan.” Tom Hanks' character, as he lay dying from his wounds says to Ryan, “Make your life worth this cost.” (or so). That is what has been asked of us, to be worthy of the price paid.

Vs. 2:29 – If you know that He is righteous, you know that everyone also who practices righteousness is born of Him -

Since you know Christ is righteous, then you know what is right to do. And since you are God’s child, then you will know to do right. I like the way NASB* puts it, “practice righteousness”.
This seems like this verse should have been at the beginning of chapter 3.
This is an “if…then” statement: If you are from (born) of Christ, then you will be righteous. Why: because He is righteous. Born: John 3:3, 5-8; 1 Pet 1:23; 1 Cor 5:17. We need to not just know about righteous behavior, but to practice it.

Know He is righteous Practice righteousness

We are God's children - practice righteousness.
End of Chapter.
* (New American Standard Bible)