John gives a warning based on the appearance of antichrist spirits and a test which Christians can use to be assured of their relationship with the Father. - 1 John 2:18-27
John writes to assure his readers that they know God, reminding them of what Christ has done for them. He goes on to give a strong warning about creating a worldly identity, saying those who do such a thing do not know the Father. - 1 John 2:12-17
John gives us a foundational statement, remarking that the purpose of his writing is so that his readers may not sin. He goes on to give a test by which we can check our progress and an exhortation to follow Jesus. - 1 John 2:1-6