a letter of encouragement
This section of the letter of 1 John addressed three groups: "little children," "fathers," and "young people." It is likely that the author was addressing the entire community when he used, "little children." Often this is how early Christian writers addressed the letters' recipients, reminding them that they are God's children. It is possible then, that addressing "fathers" and "young people" served to distinguish believers that had been following Christ for a while from those new to the faith.
Regardless, the author made it clear that all God's children were forgiven, they were given knowledge of Christ (in terms of acquaintance rather than understanding), and were walking in the light ("conquered the evil one"). This part of the letter was written to encourage the believers at a time when following Christ was difficult and dangerous. Even the strongest of believers need encouragement from time to time.
Narrative Lectionary Text: 1 John 2:12-14
I am writing to you, little children, because your sins are forgiven on account of his name. I am writing to you, fathers, because you know him who is from the beginning. I am writing to you, young people, because you have conquered the evil one. I write to you, children, because you know the Father. I write to you, fathers, because you know him who is from the beginning. I write to you, young people, because you are strong and the word of God abides in you, and you have overcome the evil one.