1 John 5:20 And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.
21 Little children, keep yourselves from idols. Amen.
John reminds us again that we know the Jesus is the Son of God and He has given us what we need to know that this true. If we have put our faith in Him we know to that it is true that He is in us and we in Him. We know all of this to be true because of the Word of God and that we a re promised eternal life through the sacrifice that Jesus gave for us. John ens this chapter to remind us we need to keep our selves away from the false teachers that are in the world today.The false teachers and idols that are out there today mean nothing to the children of God. Always strive end day to make sure you are following the the true Word of God.