After His resurrection, Jesus, somehow concealing from the dejected two disciples His physical identity, explained -
" And He said to them, O foolish and slow of heart to believe in all that the prophets have spoken! (v. 25)
.Was it not necessary for the Christ to suffer these things and enter into His glory? (v.26)
And beginning from Moses and from all the prophets, He explained to them clearly in all the Scriptures the things concerning Himself. (v.27)
And they drew near to the village where they were going, and He acted as though He would go farther. (v.28)
He taught that His resurrection was predicted by the Hebrew prophets.
He taught that from Moses and all the Old Testament prophets His resurrection was foretold.
He taught them that for Jesus to enter into His glory His resurrection was necessary.
This includes the meaning that His resurrection was a crucial part of His vindication.
Without His resurrection from the dead Jesus Christ is left un-vindicated.
In other words without His resurrection His person and teaching do not have the seal of God's approval or His own victory over sin and death.
Also without His resurrection He cannot impart Himself into man as the Spirit of life, the "another Comforter"
- the Holy Spirit. Paul, writing about resurrection says that Christ became a divine life imparting Spirit.
" the last Adam became a life giving Spirit " (1 Cor. 15:45)
Jesus taught before His death that it was expedient for Him to GO and to COME again. That is to go to the cross and come again in resurrection and impart His divine life into His followers.
" But now I am going to Him who sent Me; and none of you asks Me, Where are You going ? But because I have spoken these things to you, sorrow has filled your heart.
But I tell you the truth, It is EXPEDIENT for you that I go away; for if I do not go away, the Comforter will not come to you; but if I go, I will send Him to you.
And when He comes, He will convict the world concerning sin and concerning righteuosness and concerning judgment ..." (John 16:5-8)
It is expedient that Jesus Christ be not only physically among the disciples, but after resurrection coming INTO them to blend Himself with them. That is to incorporate Himself with them. That is to be planted in them as a seed of eternal life and grow and spread throughout their whole being.
This coming into them was a part of His being glorified and vindicated as the truth.
" And I will ask the Father, and He will give you another Comforter, the He may be with you forever, Even the Spirit of reality, whom the world cannot receive, because it does not known Him; but you know Him,
BECAUSE HE ABIDES WITH YOU AND SHALL BE IN YOU.
I WILL NOT LEAVE YOU AS ORPHANS; I AM COMING TO YOU." (John 14:16-18)
He will SEND the Holy Spirit.
The Holy Spirit is Himself in another form.
When He sends the "another Comforter"
the "Spirit of truth [or reality]"
it is Himself coming to them.
He was WITH them. After His death and resurrection He will be IN them as the "another Comforter"
to be with them for eternity.
" And I will ask the Father, and He will give you another Comforter, that He may be with you forever." (v.16)
The Spirit of reality is not on loan for a temporary time. He will be with the disciples "FOREVER"
. And His coming is the coming of Jesus in another form, not leaving them as forsaken orphans, but coming to them.
"I will not leave you as orphans; I am coming to you."
This verse is not limited to the second coming of Christ physically at the end of the age. The Gospel writer John makes it very clear that this was the coming of Jesus to INDWELL the believers, to live in them. That is to impart Himself into them for the growth of God's eternal life within their natural created lives.