Hi Theosist. Its a difficult issue because of the history. But it can be resolved imo. From the article:
"This letter of Pope St. Leo I is cited in the Catechism of the Catholic Church. Is there another Pope, saint, and great who teaches Filioque? Yes: Pope St. Gregory the Great in the 6thcentury shows the dogmatic Roman and universal tradition when he confesses, “We can also understand His being sent in terms of His divine nature. The Son is said to be sent from the Father from the fact that He is begotten of the Father. The Son relates that He sends the Holy Spirit[.] … The sending of the Spirit is that procession by which He proceeds from the Father and the Son. Accordingly, as the Spirit is said to be sent because it proceeds, so too it is not inappropriate to say that the Son is sent because He is begotten” [17]. This statement shows that, contra the Greeks, sending reveals hypostatic relation. That is why, throughout the Holy Scriptures, we never read that the Father is sent. The Father does not proceed from anyone. The Son proceeds from the Father alone, by generation, therefore He is said to be sent by the Father. The Spirit proceeds from the Father and the Son, therefore the Son explicitly says many times, “But I tell you the truth: it is expedient to you that I go: for if I go not, the Paraclete will not come to you; but if I go, I will send him to you” (Jn. 16:7) that we may understand the eternal relation implied here.
3 Objections of the Greek Church and a brief response to them — is the Filioque doctrine true, certain, established from Scripture, fathers and the early councils?
Objection I: It seems the texts cited refer not to the eternal procession of the Holy Ghost, but to His temporal mission — i.e., He is sent by the Son only in time.
This is an expected objection — one the texts themselves anticipate and answer. When the Fathers say (1) the Father gave it to the Son, in begetting Him, that the Holy Spirit proceeds from Him, they show that the procession from the Father through the Son is eternal as the generation of the Son is eternal. (2) When the Fathers say He proceeds from the Father just as He proceeds from the Son, they show that just as the procession from the Father is eternal, so it is from the Son.
Objection II: Even if the Holy Spirit’s eternal procession from the Father is mediated through the Son, it doesn’t seem to follow that He proceeds through the Son. It could be that it is merely His energetic manifestation that happens through the Son, but not that His divine hypostasis receives essence from Father through Son.
There are only two processions in the Holy Trinity, using “procession” in a broad sense (as both St. Augustine and St. Cyril do) to explain it.
(1) The eternal procession specifically called generation, by which the Person of the Father is distinguished from the Person of the Son, so that He Who begat is one Person, and He Who is begotten is another. (This second objection is almost like someone saying the Son’s hypostasis is not eternally begotten of the Father.)
(2) And the eternal procession specifically called spiration, by which the Person of the Holy Spirit is distinguished from both the Person of the Father and the Person of the Son. For He from Whom He proceeds is One Person, He through Whom He proceeds is the Second Person, and He Who proceeds is the Eternal Third Person.
This is the sense in which Pope St. Leo the Great explains it in the source cited above. Since the hypostases are distinguished, it is clearly hypostatic procession.
The answer to energetic procession is as follows: there is only One Grace and One Energy of the Three Divine Persons. For, e.g., the Grace of the Holy Spirit is not distinct from the Grace of the Son, but is identical to it. Therefore, when Son and Spirit are distinguished, as by St. Cyril, it must be Persons Who are spoken of."