There are no mysteries. There is plenty of unbelief. Christ fulfilled Isaiah 53. Unbelief is why the Jews rejected this. The Jews still interpret this as being about the nation of Israel and Israel's suffering. So, how do we benefit by poor theology and interpreting the New Testament by the Old? We don't. We interpret the Old Testament by the New. We know that Christ fulfilled this and we know that Christ came as the Messiah, and we also know that before the foundation of the world God Almighty envisioned the Church. There is nothing that can't be known if we look at the New Testament fulfillment. Now, fulfillment and consummation are very different. Christ's physical kingdom is consummated with the New Jerusalem after the new heavens and the new Earth are created. He will reign in person with all of His people, His ONE people.
Isa 53:1 Who has believed our message? And to whom has the arm of the LORD been revealed?
Isa 53:2 For He grew up before Him like a tender shoot, And like a root out of parched ground; He has no stately form or majesty That we should look upon Him, Nor appearance that we should be attracted to Him.
Isa 53:3 He was despised and forsaken of men, A man of sorrows and acquainted with grief; And like one from whom men hide their face He was despised, and we did not esteem Him.
Isa 53:4 Surely our griefs He Himself bore, And our sorrows He carried; Yet we ourselves esteemed Him stricken, Smitten of God, and afflicted.
Isa 53:5 But He was pierced through for our transgressions, He was crushed for our iniquities; The chastening for our well-being fell upon Him, And by His scourging we are healed.
Isa 53:6 All of us like sheep have gone astray, Each of us has turned to his own way; But the LORD has caused the iniquity of us all To fall on Him.
Isa 53:7 He was oppressed and He was afflicted, Yet He did not open His mouth; Like a lamb that is led to slaughter, And like a sheep that is silent before its shearers, So He did not open His mouth.
Isa 53:8 By oppression and judgment He was taken away; And as for His generation, who considered That He was cut off out of the land of the living For the transgression of my people, to whom the stroke was due?
Isa 53:9 His grave was assigned with wicked men, Yet He was with a rich man in His death, Because He had done no violence, Nor was there any deceit in His mouth.
Isa 53:10 But the LORD was pleased To crush Him, putting Him to grief; If He would render Himself as a guilt offering, He will see His offspring, He will prolong His days, And the good pleasure of the LORD will prosper in His hand.
Isa 53:11 As a result of the anguish of His soul, He will see it and be satisfied; By His knowledge the Righteous One, My Servant, will justify the many, As He will bear their iniquities.
Isa 53:12 Therefore, I will allot Him a portion with the great, And He will divide the booty with the strong; Because He poured out Himself to death, And was numbered with the transgressors; Yet He Himself bore the sin of many, And interceded for the transgressors.
Eph 1:1 Paul, an apostle of Christ Jesus by the will of God, To the saints who are at Ephesus and who are faithful in Christ Jesus:
Eph 1:2 Grace to you and peace from God our Father and the Lord Jesus Christ.
Eph 1:3 Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ,
Eph 1:4 just as He chose us in Him before the foundation of the world, that we would be holy and blameless before Him. In love
Eph 1:5 He predestined us to adoption as sons through Jesus Christ to Himself, according to the kind intention of His will,
Eph 1:6 to the praise of the glory of His grace, which He freely bestowed on us in the Beloved.
The Church/Body includes the Remnant Jews and the newly saved Gentiles. There is no parenthetical Church. That is a myth. Christ reigns now over a spiritual kingdom until the physical kingdom is consummated. If that is not true, then we can rip out Hebrews and other Books from our Bibles and save a lot of paper and trees. And, we can all convert to a dead religion called Judaism and keep having faith that the Messiah will come.