Acts 7:55,59 (NLT)
“But Stephen, full of the Holy Spirit, gazed steadily into heaven and saw the glory of God, and he saw Jesus standing in the place of honor at God's right hand. ....
As they stoned him, Stephen prayed, "Lord Jesus, receive my spirit.""
The Stoning of Stephen
For a pray to be powerful it doesn't have to be long or complicated. Remarkably, the Holy Spirit was so present with Stephen that he was able to maintain his focus on his God and saviour Jesus as he was stoned to death by the Jewish leaders. His simple prayer for Christ to receive his spirit echoes Christ's own death, where He cried out "Father, into your hands I commit my spirit" (Luke 23:46)
Ephesians 1:15-23 (NHEB)
“For this cause I also, having heard of the faith in the Lord Jesus which is among you, and the love which you have toward all the saints, do not cease to give thanks for you, making mention of you in my prayers, that the God of our Lord Jesus Christ, the Father of glory, may give to you a spirit of wisdom and revelation in the knowledge of him; having the eyes of your hearts enlightened, that you may know what is the hope of his calling, and what are the riches of the glory of his inheritance in the saints, and what is the exceeding greatness of his power toward us who believe, according to that working of the strength of his might which he worked in Christ, when he raised him from the dead, and made him to sit at his right hand in the heavenly places, far above all rule, and authority, and power, and dominion, and every name that is named, not only in this age, but also in that which is to come. He put all things in subjection under his feet, and gave him to be head over all things for the church, which is his body, the fullness of him who fills all in all "
The Apostle Paul's Prayer
Paul's prayer for the believers in Ephesus is that they would fully know and experience the great power that is at work within them - the same power that raised Christ from the dead.