“I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.”
King James Version (KJV)
2:21 I have written - Namely, #1Jo 2:13|. To you because ye know the truth - That is, to confirm you in the knowledge ye have already. Ye know that no lie is of the truth - That all the doctrines of these antichrists are irreconcilable to it.
1Jo 2:21 I have not written unto you, etc. John writes to them as those who know the truth, and know how to discern between the truth and lies.