John 17:21 that all of them may be one, Father, just as you are in me and I am in you. May they also be in us.
Are we part of the Trinity now?
Has this been fulfilled already?
Will Jesus pray for something that will not come to pass?
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The concept of "unity" in the church is one that Paul often returned to. He uses this theme several times such as:
This desire for unity among Christians was not unique - Jesus asked that the disciples:
Thus, while Christians are not part of the Godhead, Christians can share in, or be partakers of the divine nature (2 Peter 1:4) as we are being changed into Christ’s glory (= reputation), 2 Cor 3:18 and reflect it to those around us to attract other to Jesus service.
Psalm 133 takes unity and harmony as its theme:
Behold, how good and pleasant it is when brothers live together in harmony! It is like fine oil on the head, running down on the beard, running down Aaron’s beard over the collar of his robes. It is like the dew of Hermon falling on the mountains of Zion. For there the LORD has bestowed the blessing of life forevermore.
It's a pity you didn't quote v22 in the Q. Which explains what Jesus meant.
"The glory which You have given Me I have given to them, that they may be one, just as We are one;
In case you missed it...
"that they may be one, just as We are one"
Jesus is at one with the Father - not in any convoluted 'co-equal substance', but in the oneness of purpose and focus on what is the most important life we could live... putting God's will first. That's what Jesus did, unto death, and his prayer is that we might share that conviction and be led by God's spirit as he was - unto death!
Of course, our death is in Jesus, not a physical death, but a steady death of our corrupted self and an embracing of the 'new' life we have in him (Eph. 4) - as the FIRSTBORN of many brethren.
Jesus prayer is that we, his followers, might continually grow in grace and knowledge of who we are in him, to share in who he was as God's appointed servant, living out God's will to God's glory. When we submit to God's will as Jesus did - not on our own strength by any means, but to share in the victory he has already won for all men.
He has given us of his glory, which he received from the Father. But it is only revealed in us when we are at the same unified purpose that he was with the Father.
On the evening before his death, a heated argument arose among Jesus' disciples. "Who is the Greatest."
Luke 22:24 (NASB)
24 And there arose also a dispute among them as to which one of them was regarded to be greatest.
On the same evening Jesus prayed for his disciples, at John 17:15,16 Firstly, He asks his father to keep them away from the world of the evil one "Satan", then to Sanctify them and keep them in the truth (John 17:17-19) and lastly he pleads that they be in complete loving unity and forming a united congregation and to" be one just as we are one." (John 17:20-22)
Jesus does not pray for equality in godship with his Father but to oneness in purpose and action. Compare John 5:19, 5:30, 8:28 and 12:49
John 17:20-23 NASB
20 “I do not ask on behalf of these alone, but for those also who believe in Me through their word; 21 that they may all be one; even as You, Father, are in Me and I in You, that they also may be in Us, so that the world may [f]believe that You sent Me. 22 The glory which You have given Me I have given to them, that they may be one, just as We are one; 23 I in them and You in Me, that they may be perfected [g]in unity, so that the world may [h]know that You sent Me, and loved them, even as You have loved Me.
1 Corinthians 6:17 But he who unites himself with the Lord is one with Him in spirit
We are united with the Lord by our indwelling Holy Spirit. The more we are in touch with the Spirit, the more we listen to Him on a daily and hourly basis, the more we can obey him, the more we are ONE with Him. I see oneness as a process where the indwelling Spirit keeps increasing in me as I obey him more and more.
In Psalm 133:1-2, the anointing oil symbolizes the Holy Spirit is likened to unity:
How good and pleasant it is when God’s people live together in unity! It is like precious oil poured on the head, running down on the beard, running down on Aaron’s beard, down on the collar of his robe.