"Not what I will, but what thou wilt"
Mark 14 v 36
These of course were the words of Jesus in Gethsemane just prior to His crucifixion. He knowing He was going to receive the wrath of God all the sins of all He would save, submitted to the will of the Father to do this.
It is a sign of spiritual growth in a believer in Christ when we sincerely desire God's will to be done, no matter how painful or pleasant that might be. Sometimes it's getting our own way that causes us the greatest unhappiness. A high measure of godliness is when we submit to God's will in all things because we know they come from a wise, loving heavenly Father. Every day we should want nothing that isn't God's will. Our prayer needs to be that the will of God be carried out in our lives, irrespective of what that might involve. Do we really have such a submission to God's will that we can sincerely pray, "God do with me what is best for your glory and my spiritual good.”
Richard Baxter a faithful servant of God from the past, who experienced prolonged periods of pain and sickness, submitted to the loving will of God in his life as seen in his prayer, "What thou wilt; where thou wilt; when thou wilt!"
Horatius Bonar puts it this way in a hymn he wrote:
Take Thou my cup and it
With joy or sorrow fill
As best to Thee may seem;
Choose Thou my good or ill.