That the world may believe !
John 17:21
That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us:
that the world may believe that thou hast sent me.
What world is Jesus speaking of here ? One viable understanding could be the World of all Believers outside of the Apostles who were chosen messengers from among the jews that had a message to take to the world at large for the calling out of God's Elect from among the nations, that is the seed of Abraham from among the gentiles
Matt 28:19-20;
Lk 24:47;
Jn 17:20;
Gen 17:5-8;
Gal 3:8
Or it could be the world of
John 17:9
9 I pray for them:
I pray not for the world, but for them which thou hast given me; for they are thine.
BTW Those whom the Father gave Him is also a World
Jn 3:16, though not the same one He does not Pray for !
So it could be the World of the reprobate, whom at the Second Coming of Christ, when He comes to Judge the World in Righteousness
Acts 17:31
31
Because he hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead.
That then that reprobate world will come to believe and be condemned, because they received not the Love of the Truth that they might be saved, and so did send them a strong delusion so that they could believe what was false
2 Thess 2:10-12
10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
11 And for this cause
God shall send them strong delusion, that they should believe a lie:
12 That they all might be damned who believed not the truth,
but had pleasure in unrighteousness. in lies !
This is the World that Paul stated it shall be condemned
1 Cor 11:32
32 But when we are judged, we are chastened of the Lord,
that we should not be condemned with the world.
This World the Elect were effectually called out of
Rev 18:4. I believe this World is also identified in
Rev 3:8, as that synagogue of Satan, which say they are jews [God's professing People], but they are liars and deceivers, and they will come to know that to their everlasting shame, they will then believe or be convinced
Jude 1:15
15 To execute judgment upon all, and
to convince all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hard speeches which ungodly sinners have spoken against him.
They will come to know who it was that God Loved in Christ
Rev 3:8, but then of course it will be everlastingly too late for them, and then that world will meet with its preordained condemnation at the great White Throne Judgment, with those God did Love and Christ did die for being witnesses of their condemnation
Ps 37:34;
52:5-7;
91:8 ! So there is a appointed time when the unbelieving religious world will believe, but it will be at the Second Coming of Christ when He comes to be Glorified in His Saints, and to put the foolish virgins to everlasting shame and contempt
Dan 12:4, So the end of which this believing of the condemned world is designed for, is the Glory of God's Justice in their own condemnation !