|child Jesus with the virgin Mary, with the Holy Spirit (represented as a dove) and God the Father, with child john the Baptist and saint Elizabeth on the right (Photo credit: Wikipedia)|
What, then, is our doctrine? The Lord, in delivering the saving Faith to those who become disciples of the word, joins with the Father and the Son the Holy Spirit also; and we affirm that the union of that which has once been joined is continual; for it is not joined in one thing, and separated in others. But the power of the Spirit, being included with the Father and the Son in the life-giving power, by which our nature is transferred from the corruptible life to immortality, and in many other cases also, as in the conception of “Good,” and “Holy,” and “Eternal,” “Wise,” “Righteous,” “Chief,” “Mighty,” and in fact everywhere, has an inseparable association with them in all the attributes ascribed in a sense of special excellence. And so we consider that it is right to think that that which is joined to the Father and the Son in such sublime and exalted conceptions is not separated from them in any.
 Gregory of Nyssa. (1893). On the Holy Trinity, and of the Godhead of the Holy Spirit H. A. Wilson, Trans.). In P. Schaff & H. Wace (Eds.), A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, Second Series, Volume V: Gregory of Nyssa: Dogmatic Treatises, etc. (P. Schaff & H. Wace, Ed.) (327). New York: Christian Literature Company.