"But you have an anointing from the Holy One, and you know all things. I have not written to you because you do not know the truth, but because you know it, and that no lie is of the truth." (1John 2:20-21).

John wrote this verses to young believers at a time when so much false doctrine was entering into the Church. The problem was, how would Christians tell which of these doctrine is true and which is a lie. John was to address this issue but instead of telling them which is the true doctrine and which is false John simply told them that they know the truth. He explained to them that God has anointed every Christian and has given us an ability to know the truth. He explained that we can look at two doctrines and tell which is true and which is false.

This is a ability that Christians till today have not explore. John explained this to those young believers so that they can explore this ability but rather than exploring this ability they ignored John's words and after his death...
Follow the link below to read the full article:
http://www.hiswordxray.com/2017/10/the-anointing-to-know-truth.html?m=1

Excellent