Power may be produced through

"To be sure this requires effort and love a careful cultivation of the spiritual life and a watchful honest active oversight of all one's mental attitudes towards things and people. It is not to be learned by world-flight running away from things turning solitary and going apart from the world. Rather one must learn an inner solitude where or with whomsoever he may be. He must learn to penetrate things and find God there to get a strong impression of God firmly fixed on his mind."
Meister Eckhart