Ryrie states that Christians agree that spiritual power relates to the work of the Holy Spirit.
“A Christian is one who has received Jesus Christ; a spiritual Christian is one who displays Christ living through his life, and this is accomplished by the work of the indwelling [Italics added] Holy Spirit. Spirituality, then, is Christlikeness that is produced by the fruit of the Spirit. What better portrait of Jesus Christ is there than ‘love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control’ (Galatians 5:22-23)? These characteristics describe the fruit of the Spirit, and they picture our Lord. Spiritual power is not necessarily or usually the miraculous or spectacular, but rather the consistent exhibition of the characteristics of the Lord Jesus in the believer’s life. And this is the activity of the Holy Spirit, of whom the Lord Jesus said, ‘He shall glorify Me.’”
I have endeavored in my books and blogs to give a compelling substantiation to the dual interaction between the Mind of God through His Holy Spirit and the mind of Man through His created synaptic networks of the human brain in our time. It is an immaterial interaction with the material, the immaterial being everlasting.