The opening of the second Johannine epistle warns against antichrist deceivers who claim Christ but aren't born again. I believe the Antichrist himself will come out of the Body of Christ.

John closes his epistle with a warning against idolatry which was dangerous for believers then as it is now. 

There are some interesting verses here with an important history. Here John talks about the importance of the water and blood and its implications for the life of Jesus.

Those who are born again keep the commandments. In these verses, John explains how the commandments are not burdensome but rather, the key to freedom.

Love is one of the most important tenets of the Christian faith and our walk should be defined by love for all of our neighbors and love for our fellow believers. John describes the importance of love in these verses.

A warning is issued by John that not every spirit, prophet, pastor, or teacher that confesses Jesus Christ is actually born again and that many people abuse the gospel for their own benefit. 

John opines on the importance of love as a Christian. In fact, John obviously feels so strongly about the subject that he uses rather poignant language. 

Sinning as a child of God is the focal point of the opening of chapter three of the first Johannine epistle. 

Here John refers to the Big "A" AntiChrist and I discuss some of the Scriptures that give us information about him and the circumstances in which he will come.

The three different types of sin comprise these verses as John gives an exhortation to not love the world.