The prayer Jesus offers for His disciples sums up everything said during the Last Supper. It is usually called the prayer for unity, and one can undoubtedly agree with this. Yet it concerns not only outward unity. Jesus again asks the Father to preserve between Him and His disciples the same union that He has with the Father (vv. 21-23). Apparently no testimony is possible without such unity; without it the world will not believe that the apostles truly were sent into the world by the Savior Himself.
Yet bearing witness to the Kingdom and revealing the Kingdom to the world are precisely the chief task of those who are sent. Addressing the Father, Jesus in a sense hands over to the apostles the mission the Father entrusted to Him, while entrusting the apostles themselves to the Father. He says: I have given the life of the Kingdom that You gave Me to everyone who wished to receive it; I have accomplished everything You entrusted to Me (vv. 1-5). I revealed Myself, You, and Your Kingdom to those whom You sent Me, and they accepted everything (vv. 6-8). And now, Jesus says, I am leaving while they remain, and I pray for them, for those who belong to You (vv. 9-11).
Such a request was entirely natural, for the apostles were now becoming witnesses to the Kingdom about which Jesus had previously spoken to the world, and the apostolic community was to become the nucleus of the Church. Previously Jesus Himself had kept His disciples safe in a world hostile to them. Now, as He goes to the Father, He asks the Father to help the apostles preserve the joy of the Kingdom that they knew during the Savior's earthly ministry (vv. 12-13). This does not mean removing the apostles from the world to some other, special reality. The Kingdom had to be revealed here, not somewhere on another planet or in another dimension (vv. 14-16). But to reveal it, the apostolic community had to be sanctified by receiving the fullness of God's living revelation, which the Savior Himself embodied (v. 17). Only then could the apostles become witnesses to the Kingdom and their community the nucleus of the Church, whose very purpose would be to preserve the Kingdom in our still not fully transformed world and bear witness to it. This nucleus would grow, and the Church would expand, including everyone who sought the Kingdom and eternal life (vv. 18-21).
