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Secondly, if the Filioque was at one time believed widely in the West, but later condemned by the Church as heretical, you should be able to show us the Ecumenical Council where this happened. But you will find no such Council, as documented above, the closest is where the Fifth Ecumenical Council condemned Thodoret's former anathemas against St. Cyril, specifically the ninth, for saying the Spirit has His existence from and through the Son with the Father. St. Cyril is perhaps among the clearest of the Greek Fathers to express this teaching, as he does in many passages "since He is the Word from God the Father, and from His own nature He causes Him to fountain upon us." as well as the complementarity of the two traditional formulations of East and West, "the Spirit is from God the Father and, for that matter, from the Son, being poured forth substantially from both, that is to say, from the Father through the Son." Please address, if you anathematize this statement, how you are not doing what Constantinople II said you shouldn't do?
St. Cyril, in response to this anathema, clarified that the Spirit proceeds from the Father, according to the words of Lord, but that the Spirit is not alien to the Son, for the Spirit glorifies Jesus, performing incomprehensible works, but he does so as Jesus' own Spirit and not as an an alien power or something greater. (You can see his response in PG 76 433). St. Cyril does not, to my knowledge, dispute Theodoret's assertion that the Holy Spirit does not have existence from or through the Son, but only clarifies his own Christological concerns. Theodoret was seemingly satisfied with this answer, as he later remarked that he found St. Cyril's answer to be orthodox.
Insofar as Theodoret's anti-Cyrillian writings were condemned in general for their opposition to Cyril and the Twelve Chapters (the council, in other words, did not conjure up specific counter-anathematisms to dispute doctrinal points in the letters), to say that the proposition that the Holy Spirit does not have existence from or through the Son was condemned would be a real stretch, since the proposition was neither denied by St. Cyril (indeed, he seems to affirm it, though only weakly), nor is it directly opposed to the teachings of the Twelve Chapters.