I have written to you, fathers, because you know him who is from the beginning. I have written to you, young men, because you are strong, and the word of God remains in you, and you have overcome the evil one.

 John says that he who denies the Son has not the Father either. What lies behind that saying is this. The false teachers pleaded, "It may be that we have different ideas from yours about Jesus; but you and we do believe the same things about God." John's answer is that that is an impossible position; no man can deny the Son and still have the Father. How does he arrive at this view? 