I have not written to you because you don't know the truth, but because you know it, and because no lie is of the truth.

 In this verse we meet the conception of Antichrist. Antichrist is a word which occurs only in John's letters in the New Testament ( 1 John 2:22; 1 John 4:3; 2 John 1:7); but it is the expression of an idea which is as old as religion itself. 