That is a profound question, because on one level you are absolutely right.
If John 17 had never been recorded, Jesus would still have gone to the Cross.
The Father would still have sent the Son.
The Son would still have obeyed.
The resurrection would still have happened.
The salvation of God’s people would still have been accomplished according to the eternal purpose of God (Ephesians 1:4-11; Acts 2:23).
So the prayer is not necessary to make the Cross effective.
The question becomes: Why did God allow us to hear it?
π We Are Listening to Something We Were Never Meant to Create
John 17 does not change God’s plan.
It reveals God’s heart.
Much of Scripture tells us what God does.
John 17 lets us hear why He does it.
Before the Cross, Jesus pulls back the veil and allows the disciples to overhear a conversation between Father and Son.
It is similar to Moses asking:
“Please, show me Your glory.”
β Exodus 33:18
God’s answer was not merely to show power but to reveal His heart:
“The LORD, the LORD God, merciful and gracious, longsuffering, and abounding in goodness and truth.”
β Exodus 34:6
John 17 is a revelation of divine affections before it is a revelation of divine actions.
β€οΈ We Learn What Was In Christ’s Heart Before The Cross
Had the prayer not been recorded, we would know Christ died for us.
Because it is recorded, we know what He was thinking about before He died.
Notice what occupies His mind:
- The Father’s glory (John 17:1)
- The disciples (John 17:6-19)
- Future believers (John 17:20)
- Unity among believers (John 17:21)
- Our final presence with Him (John 17:24)
Not one word of self-pity.
Not one complaint.
Not one expression of resentment.
Hours before enduring the wrath-bearing suffering of the Cross, His concern is still for the Father and for His people.
That tells us something about the nature of divine love.
π It Shows We Were Not An Afterthought
One of the most astonishing verses is:
“Neither pray I for these alone, but for them also which shall believe on Me through their word.”
β John 17:20
That means Jesus is praying for believers not yet born.
For people who would live centuries later.
For people scattered across nations.
For people who had not yet existed.
If the prayer were absent, we could infer that Christ loved future believers.
Because it is recorded, we hear Him explicitly speak of them before the Cross.
The Shepherd already had His flock in mind.
π It Reveals The Goal Of Redemption
Many Christians think salvation is mainly about forgiveness.
John 17 shows something greater.
Jesus says:
“Father, I desire that they also whom You gave Me may be with Me where I am, that they may behold My glory.”
β John 17:24
That is the climax of the prayer.
Not merely forgiveness.
Not merely escape from judgment.
Not merely entrance into heaven.
The goal is fellowship with Christ Himself.
To see His glory.
To be with Him.
Without John 17 we would still find this truth elsewhere in Scripture, but nowhere is it expressed so directly from the lips of Jesus Himself.
πΏ It Reveals Eternal Relationships
The Cross reveals God’s love.
John 17 reveals that this love existed before creation.
“You loved Me before the foundation of the world.”
β John 17:24
That single statement takes us back before Genesis 1:1.
Before angels.
Before stars.
Before Adam.
Before time.
Before sin.
Before redemption.
Before creation.
There was the Father loving the Son.
The Cross was not the beginning of divine love.
It was the manifestation of an eternal love already existing within God.
That is something we would hardly dare to imagine if Jesus had not said it Himself.
β¨ A Witness For Future Generations
There is another purpose.
The prayer becomes evidence.
John was there.
The disciples heard it.
The Spirit preserved it.
Future believers would read it.
Notice how often Jesus speaks of things that the Father already knows.
The prayer is not merely information for God.
It is revelation for us.
In a sense, Jesus is praying in our hearing.
Just as at Lazarus’ tomb He said:
“Because of the people who are standing by I said this, that they may believe that You sent Me.”
β John 11:42
John 17 serves a similar function.
The prayer teaches the Church what the Son desires for His people.
π Perhaps The Most Beautiful Reason
If John 17 were missing, we would still know Christ died for us.
But we would not know that immediately before the Cross He spoke to the Father about us.
We would know the sacrifice.
We would know less of the heart behind the sacrifice.
John 17 is like being allowed to read a sealed letter exchanged between the Father and the Son before the greatest act in history.
The Cross tells us what Jesus did.
The priestly prayer lets us hear what Jesus loved.
And perhaps that is why the Holy Spirit preserved it. Not because the Cross needed the prayer to accomplish redemption, but because redeemed people needed the prayer to understand the heart of their Redeemer. β€οΈπβοΈ
As Paul would later write:
“The Son of God, who loved me and gave Himself for me.”
β Galatians 2:20
The Cross proves He gave Himself for us.
John 17 lets us overhear that love speaking before He did. πβ¨