Read 1 John 5:9-13
9We believe human testimony; but God’s testimony is much stronger, and he has given this testimony about his Son. 10So all who believe in the Son of God have this testimony in their own hearts; but those who do not believe God have made him out to be a liar, because they have not believed what God has said about his Son. 11The testimony is this: God has given us eternal life, and this life has its source in his Son. 12Whoever has the Son has this life; whoever does not have the Son of God does not have life.
13 I am writing this to you so that you may know that you have eternal life—you that believe in the Son of God.
From 1 John 4:1 John invites the congregation to be discerning in what it accepts and rejects. Test the Spirits he instructs them. The Spirit that is from God produces Christ like love in the heart; this is how we know that we truly believe in him and belong to him.
Lord help me to know that I belong to you - produce your likeness, your love in me.