1 John 5:13

Verse 13. That ye may know that ye have eternal life] I write to show your privileges-to lead you into this holy of holies-to show what believing on the Son of God is, by the glorious effects it produces: it is not a blind reliance for, but an actual enjoyment of, salvation; Christ living, working, and reigning in the heart.

And that ye may believe] That is, continue to believe: for Christ dwells in the heart only by FAITH, and faith lives only by LOVE, and love continues only by OBEDIENCE; he who BELIEVES loves, and he who LOVES obeys. He who obeys loves; he who loves believes; he who believes has the witness in himself: he who has this witness has Christ in his heart, the hope of glory; and he who believes, loves, and obeys, has Christ in his heart, and is a man of prayer.