John 17.20-23 cont.
20 But it is not only about them that I ask, but also about those believing in Me because of their word.
21 That they might all be one, even as You, Father, are in Me and I in You, that they might also be in Us, so that the world might believe that You did send Me.
22 And the glory which You have given to Me I have given to them, so that they might be one even as We are one.
23 I in them and You in Me, that they might be perfectly one, so that the world might know that You sent Me and You loved them, even as you love Me.
These days there are companies who send their employees away to gain team building skills. The objective being to bring a unity amongst the workforce that assists the company in its’ trading. This can happen in various ways from team games to conferences. Unity of mind and purpose is very important in business, as it is in every walk of life.
Jesus returns to the theme of oneness and He states that there is a oneness between Jesus and the Father, and that there is a oneness between Himself and His followers, which means that there is a oneness between Father, Jesus, and His followers. This is something that we might find is beyond our understanding, yet it is true, and it is part of the glory that we receive from Jesus and the Father. All is brought to us by the indwelling of the Holy Spirit within us.
One of the great things about our oneness in Jesus and the Father is the oneness that all believers are given.
Paul refers to this:
 And all who have been united with Christ in baptism have been made like Him.
 There is no longer Jew or Gentile, slave or free, male or female. For you are all Christians—you are one in Christ Jesus – Galatians 3.28 (NLT). This is the glory of the Church of Jesus: His Body is One. Whatever part of the body we are, we are one, fulfilling a function that enables the Body to be effective for Jesus within this world.
It is sad that the Church has created a structure that dismantles unity and oneness, where some are thought of more highly than others. This was never the desire of Jesus, and we must continuously work to maintain the unity of the Holy Spirit.
The oneness that we have in Jesus is vitally important in an evangelistic sense, because it is when the world sees the oneness of believers that it will also believe that the Father sent Jesus into the world.
Therefore, we must take seriously the oneness that we have with other followers of Jesus, whatever denominations they may be in.