The Nature of the Body and the Soul

"For just as the body lives from the soul, so does the soul live from God... It lives as one spirit with him. For the Will of the Father and the Son--Holy Spirit, by an inconceivable grace, with unutterable joy, by most secret inspiration, in a most manifest operation, conforms the will of the soul to himself, uniting its love to himself with spiritual omnipotence. He becomes so united with the soul that, as has been said, when the soul prays with aspirations beyond conception, it is rather the Spirit who is said to pray. And this is the prayer of the Son to the Father: 'I will [that is, I bring it about by the power of my will which is Holy Spirit] that as I and you are one in substance, so they also may be one in us through grace.' One in love, one in beatitude, one in immortality and incorruption, and even in some way in divinity itself. For 'to as many as received him he gave the power to become sons of God.'"
~William of St. Thierry