I did research and wrote an article on the
Filioque for 1P5. It is the clear consensus of the Latin Fathers.
Per Filium or through the Son is the clear consensus of the Greek and Eastern Fathers. Florence decreed that the two formulas are equivalent and both acceptable. The Holy Father proceeds from the Father and the Son, which is the same as saying He proceeds from the Father through the Son. Thus St. Thomas also.
From:
https://onepeterfive.com/filioque-separated-east/[
1] Five Ecumenical Councils approved a letter of Patriarch St. Cyril of Alexandria that taught the Dogma of the Filioque!Cardinal St. Robert Bellarmine gives a manifest proof establishing the doctrine from the authority of five ecumenical councils:
Omitting these things, then, let us bring forward the Councils that testify the Holy Spirit proceeds from the Son. First the Council celebrated at Alexandria, from which Council Cyril writes a letter to Nestorius in which are these words, ‘The Spirit is called the Spirit of Truth, and Christ is Truth, and so He proceeds from Him likewise as from the Father.’ This letter was read in the Council of Ephesus and was approved both by the Council of Ephesus itself and by the fourth Synod, and by the fifth Synod and by the sixth and seventh Synods. We have therefore five general Councils celebrated among the Greeks which receive the most open and clear opinion that the Holy Spirit proceeds from the Son as from the Father. What then do they now seek? What do they demand?
Patriarch St. Cyril and the five ecumenical councils mentioned by Cardinal St. Robert Bellarmine give us the patristic and Church-authorized interpretation of the Word of Christ in Sacred Scripture. As we will see subsequently, Bishops like St. Hilary, St. Ambrose, and St. Augustine had already done this in the West in the 4th century.
[2] Greek Orthodox Bishops and Patriarchs, at Nicene Ecumenical Councils, confess doctrine practically equivalent to the Filioque.As if that were not enough, we have the testimony of two Eastern saintly bishops, one of whom was patriarch of the Greek Church and made a dogmatic confession.
Bp. St. Leontius of Caesarea, at Nicaea I, testifies that “the Spirit proceeds from the Father, and is proper to the Son and gushes forth from Him” [3]. This is the Faith of the 318 fathers gathered at Nicaea. As Cardinal St. Robert writes, it was not explicitly defined in Nicaea, because the necessity had not yet arisen, as the ancient fathers testified, “I for my part cannot sufficiently wonder with what boldness Jeremias, who calls himself Ecumenical Patriarch, dared to write recently in his censure of the confession of the Lutherans that it was defined by the Synod of Nicaea and all subsequent general Councils that the Holy Spirit proceeds from the Father alone[.] … Let us then consult the Nicene Creed, and let us see whether it teaches in very expressive words that the Holy Spirit proceeds from the Father alone. The whole Nicene Creed is cited by Cyril among the Greeks, by Ruffinus among the Latins, but nothing else is read in that Creed about the Holy Spirit than this opinion ‘and [I believe] in the Holy Spirit.’ Now Nazianzen testifies that the Nicene Synod did not hand on the perfect doctrine about the Holy Spirit for the reason that the question about the Holy Spirit had not arisen. Let Jeremias see in which Nicene Creed he has read that the Holy Spirit proceeds from the Father alone.”
Patriarch St. Tarasius of Constantinople, at Nicaea II, declared, in the Creed, “And in the Holy Spirit, the Lord and Giver of Life, Who Proceeds from the Father through the Son, and is acknowledged to be Himself God” [4]. Just as the 150 fathers at Constantinople I added to the Creed of Nicaea the words, “the Lord and Giver of Life, Who Proceeds from the Father,” etc., Patriarch St. Tarasius here adds the words “through the Son,” etc. This shows the Faith of the Universal Church at Nicaea II.
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3] Great Latin bishops and fathers exegete and interpret the words of Sacred Scripture in favor of the Filioque doctrine.Bishop St. Hilary of Poitiers says it is one and the same thing to proceed from the Father, receive from Him and from His Son ...