The New Testament word koinonia refers to sharing in something. Before the world began Father and Son shared in the divine life as they mutually indwelt one another in the Spirit. Within this communion of love they also shared an ultimate purpose. The Father delighted in his unique Son so much that he wanted to create a vast family of sons like his Son. This single purpose arose out of the self-giving love of the three. And the three persons are always together in achieving this single purpose. For the Father continually works to accomplish this shared purpose through his Son and by his Spirit until the purpose comes to fullness. Then the Son will say to his Father here I am and the children you have given me.
John tells us, “…that which we have seen and heard we proclaim also to you, so that you too may have fellowship (koinonia) with us; and indeed our fellowship (koinonia) is with the Father and with his Son Jesus Christ” (1 John 1:3-4). In the communion (koinonia) of the Spirit we share ever more deeply in the life and love of Father and Son. For in the Spirit we know that we are in Jesus and that he is in us. And in that living union we share in his relationship with the Father now and forever. In the communion (koinonia) of the Spirit we also await ever more eagerly the consummation of the eternal purpose. For the Jesus that we are one with is the goal of all things and we are fully included in him. All this makes our joy complete.