Charles Spurgeon Commentary 1 John 2:27-28

"And as for you, the anointing which ye received of him abideth in you, and ye need not that any one teach you; but as his anointing teacheth you; concerning all things, and is true, and is no lie, and even as it taught you, ye abide in him. And now, [my] little children, abide in him; that, if he shall be manifested, we may have boldness, and not be ashamed before him at his coming." — 1 John 2:27-28 (ASV)

But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him. And now, little children, abide in him. This shows how John continues to urge us to stand fast in Christ. As the Holy Ghost has taught us to trust Christ, so he would have us "abide in him."

And this is one great reason why we are to abide in him.

And you do not need anyone to teach you: but as the same anointing teaches you of all things, and is truth, and is no lie, and even as it has taught you, you shall abide in him. And now little children, abide in him;

See how the apostle rings out this note again and again. Our Saviour repeated the word "abide" or "remain" many times in the short parable of the Vine, and now John strikes this same silver bell over and over again: And now, little children, abide in him;