1 John 2:26-27

I am writing these things to you about those who are trying to lead you astray. As for you, the anointing you received from him remains in you, and you do not need anyone to teach you. But as his anointing teaches you about all things and as that anointing is real, not counterfeit—just as it has taught you, remain in him.

(v26-27, NIV)

John makes it clear who he is talking about. John is writing about these antichrists who are trying to lead others astray. With their false teachings and distortions of the truth, they deceive others. However, for those who abide in him and have received his anointing, they do not need anyone to teach them. We have the anointing from him that will teach us. If we have received this anointing, why do we need to go around looking in these antichrists for teaching? This doesn't mean we do not learn from others. Rather, if we are to receive teaching, it must be from God. Therefore, if we are to learn from someone else, the teaching they bring should be from God. One important thing, as John just mentioned, is that the liar is the one who denies that Jesus is the Christ. One obvious sign that the teaching is not from God is that the person denies the son. Further on in 1 John we read that John tells us to test the spirits. We need to test teachings and sayings to see whether they are really from God or not. Test it according to the scriptures; test it according to what they say and their character. Do not be deceived.