“The Holy Spirit exists and dwells in those who receive Him, and He does so to such an excellent extent and with such transforming power, that “such a person no longer lives according to the flesh, but is led by the Spirit of God. He is called a son of God, because he is conformed to the image of the Son of God; we call him a spiritual man.”
This is an extraordinary statement. It means that the Holy Spirit, received initially through baptism and chrismation, actually transforms our very being, our “essence” or “form,” to the point that we are “conformed to the image” of Christ. We become “spiritual beings,” oriented and directed no longer according to the flesh, but according to the Spirit, who is God Himself.
At the close of this same chapter, St. Basil alludes to a passage from the apostle Paul: “The Spirit helps us in our weakness; for we do not know how to pray as we ought, but the Spirit Himself intercedes for us with sighs too deep for words” (Rom. 8:26). Basil concludes, “If you remain outside the Spirit, you cannot worship at all, and if you are in Him you cannot separate Him from God. Light cannot be separated from what it makes visible, and it is impossible for you to recognize Christ, the Image of the invisible God, unless the Spirit enlightens you.”
This means first of all that authentic worship is possible only through the indwelling power of the Holy Spirit. Yet beyond that, it implies that true prayer is not a human endeavor at all. It is the work of God within us. In prayer, God speaks to God; the Spirit addresses the Father within the temple of the heart. Through that divine work, the Spirit illumines for us and within us the “Face,” the image and glory of the Son. Bated in the radiant light of that divine Image, we recognize Christ for who He is: we behold Him as Lord and Savior, the Crucified and Risen One. And that Image in turn reveals to us the Face of the Father.” (John Breck, Longing for God, p. 171)