that which we have seen and heard we declare to you, that you also may have fellowship with us. Yes, and our fellowship is with the Father, and with his Son, Jesus Christ.
In chapter 16 of the gospel of John, he relates the fullness of joy to our prayer life, "Henceforth you've asked nothing in My name: ask, that you may receive, that your joy may be full" ( John 16:23-24 ). Here, the fullness of joy is related to fellowship with God, a life of fellowship with God. Abiding in Christ is a life of fullness of joy.