Going too far...

 II John: 6 And this is love, that we walk according to his commandments; this is the commandment, just as you have heard from the beginning, so that you should walk in it. 7 For many deceivers have gone out into the world, those who do not confess the coming of Jesus Christ in the flesh. Such a one is the deceiver and the antichrist. 8 Watch yourselves, so that you may not lose what we have worked for, but may win a full reward. 9 Everyone who goes on ahead and does not abide in the teaching of Christ, does not have God. Whoever abides in the teaching has both the Father and the Son. 

John is truly the Apostle of Love, as we saw in his first letter.  That theme comes out again. Obedience - walking according to Christ's commands - is the sign that we have received the love of God in Christ. What obedience does not do is replace Christ.  Many false teachers then and now "go on ahead", adding to Christ as Savior and Lord. This devalues the person and work of Christ, making Him less than Who He is.  We must beware those who go to far, adding to the simplicity of Christ, or making too little of Who He is.