We must exercise extreme caution when discussing the will and mind of divinity - the only one who understand s the mind of God is God Himself. If we understood God completely we would be God. The doctrine we are touching on here concerns what is described as the voluntary divine humiliation of Christ. See below.
The human mind and will is obviously quite different and much more limited compared to the divine will. Thus, I do not believe it is immediately possible to use Mark 9:23 to illuminate Matt 26:39.
Voluntary Divine Humiliation
Note that before His incarnation, Jesus enjoyed the full status of divine glory in heaven with God:
- John 17:5 - And now, Father, glorify Me in Your presence with the glory I had with You before the world existed.
- John 1:1, 2 - In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning.
From this exalted status, Paul describes the greatest humiliation of all time, when Jesus became a human as described in Phil 2:5-8:
Let this mind be in you which was also in Christ Jesus: Who, existing
in the form of God, did not consider equality with God something to be
grasped, but emptied Himself, taking the form of a servant, being made
in human likeness. And being found in appearance as a man, He humbled
Himself and became obedient to death— even death on a cross.
Note that this is clearly a process and decision taken by Jesus with the apparent support of the Father. This is stated again in John 10:17, 18 -
"The reason the Father loves Me is that I lay down My life in
order to take it up again. No one takes it from Me, but I lay it
down of My own accord. I have authority to lay it down and
authority to take it up again. This charge I have received from My
Again, it is emphasized that this was done voluntarily by Jesus. The great struggle that Jesus had in the Garden of Gethsemane was (among other things) to continue to go through with the decision to sacrifice Himself; not only for the great physical agony He knew He would experience but for the emotional and pain created by separation from the Father (Matt 27:46).
Thus, it appears Jesus made a deliberate choice to save humanity despite the personal cost, a very great cost with which He clearly struggled in Gethsemane (Matt 26:38, 39) - even seeking human companionship to help in His time of need (Matt 26:40).
Jesus did not have to do this - He could have abandoned humanity in its sin - or perhaps He was asking God if there were another way to redeem humanity without the terrible cost; BUT His great love for us, and His obedience to the Father's will, made Him decide to go through with this.
The Pulpit Commentary has some useful insights:
Let this cup pass from me. The "cup" is the bitter agony of his
Passion and death, with all their grievous accompaniments (see Matthew
20:22, and note there). All heroism and manly endurance in the face of
pain and death Christ exhibited to the full; but the elements of
suffering in his case were different, and fraught with exquisite
torture (see above, on ver. 28). Such was the anguish that it would
have then separated soul and body - of such rigour that "his sweat
became as it were great drops of blood falling down upon the ground" -
had not an angel appeared from heaven to strengthen and support the
fainting human life (Luke 22:43, 44). Nevertheless not as I will, but
as thou wilt. In this prayer are shown the two wills of Christ, the
human and Divine. The natural shrinking of the human soul from
ignominy and torture is overborne by entire submission to and
compliance with the Divine purpose. So it is said that the Captain of
our salvation was made perfect through sufferings, learned obedience
by the things which he suffered (Hebrews 2:10; Hebrews 5:8) By this
passage the Monophysite and Monothelite heresies are clearly refuted,
the two natures and two wills of Christ being plainly displayed.