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.

 As things have turned out, John sees in the Church a time of sifting. The false teachers had voluntarily left the Christian fellowship; and that fact had shown that they did not really belong there. They were aliens and their own conduct had shown it to be so. 