JPrejean:
I like St. John Damascene as well.
““Likewise we believe also in one Holy Spirit, the Lord and giver of life . . . God existing and addressed along with Father and Son; uncreated, full, creative, all-ruling, all-effecting, all-powerful, of infinite power, Lord of all creation and not under any lord; deifying, not deified; filling, not filled; sharing in, not shared in; sanctifying, not sanctified; the intercessor, receiving the supplications of all; in all things like to the Father and Son;
proceeding from the Father and communicated through the Son” (Exposition of the Orthodox Faith 8 [A.D. 712]).”
Yes, comunicated through the Son at Pentecost… as Saint John explains…
“…we confess that He is manifested and communicated to us through the Son. For He breathed upon His Disciples, says he, and said, Receive ye the Holy Spirit. It is just the same as in the case of the sun from which come both the ray and the radiance (for the sun itself is the source of both the ray and the radiance), and it is through the ray that the radiance is imparted to us, and it is the radiance itself by which we are lightened and in which we participate.”
Notice what Saint John says in Book 1, chapter 7 - not one word that the Spirit proceeds from the Son…but merely that the Spirit is the companion of the Son (inasmuch as both share their origin in the Father) and he comes to rest in the Son. It would not be correct of Saint John to call Him only the companion of the Son if the Son were also His source.
“…so also, when we have learnt about the Spirit of God, we contemplate it as the companion of the Word and the revealer of His energy, and not as mere breath without subsistence. For to conceive of the Spirit that dwells in God as after the likeness of our own spirit, would be to drag down the greatness of the divine nature to the lowest depths of degradation. But we must contemplate it as an essential power, existing in its own proper and peculiar subsistence, proceeding from the Father and resting in the Word(4), and shewing forth the Word, neither capable of disjunction from God in Whom it exists, and the Word Whose companion it is, nor poured forth to vanish into nothingness(5), but being in subsistence in the likeness of the Word, endowed with life, free volition, independent movement, energy, ever willing that which is good, and having power to keep pace with the will in all its decrees(6), having no beginning and no end. For never was the Father at any time lacking in the Word, nor the Word in the Spirit.”
and…
"We believe in one Father, the beginning, and cause of all: begotten of no one: without cause or generation, alone subsisting: creator of all: but Father of one only by nature, His Only-begotten Son and our Lord and God and Saviour Jesus Christ, and
Producer of the most Holy Spirit.
and…
“For the Father alone is ingenerate, no other subsistence having given Him being. And the Son alone is generate, for He was begotten of the Father’s essence without beginning and without time. And only the Holy Spirit proceedeth from the Father’s essence, not having been generated but simply proceeding. For this is the doctrine of Holy Scripture. But the nature of the generation and the procession is quite beyond comprehension.”
and…
“Likewise we believe also in one Holy Spirit, the Lord and Giver of Life: Who proceedeth from the Father and resteth in the Son…proceeding from the Father and communicated through the Son”
and…
“the Son is derived from the Father after the manner of generation, and the Holy Spirit likewise is derived from the Father, yet not after the manner of generation, but after that of procession. And we have learned that there is a difference between generation and procession, but the nature of that difference we in no wise understand. Further, the generation of the Son from the Father and the procession of the Holy Spirit are simultaneous.”