The Filioque is accepted as a Theological belief in the 3rd Ecumenical Council. It is not approved for the Creed, however, it also is not debated as being bad theology or heresy. I will not join in a Filioque debate. I am posting this for informational purposes for my Eastern and Western Catholic brothers to use in defense of our faith.
This quote from the Third Letter of St Cyril of Alexandria to Nestorius was approved by the 3rd Ecumenical Council.
“For even if the Spirit exists in his own hupostasis, and moreover is considered by himself insofar as he is the Spirit and not the Son, yet he is not therefore alien from the Son, for he is called the Spirit of truth and Christ is the truth, and the Spirit proceeds from him, just as undoubtedly he also proceeds from God the Father.” - St Cyril of Alexandria, Letter 17:17 (Third Letter to Nestorius)
From: “The Fathers of the Church, St Cyril of Alexandria, Letters 1-50” translated by John I. McEnerney
Nihil obstat: Rev. Michael Slusser, S.T.B., D. Phil. Censor Deputatus
Imprimatur: Rev. Msgr. Raymond Boland, Vicar General for the Archdiocese of Washington
Copyright © 1987 by The Catholic University of America Press, Inc.
Another translation:
“For even though the Spirit exist in His Own Person, and is conceived of by Himself, inasmuch as He is the Spirit and not the Son, yet is He not therefore alien from Him; for He is called the Spirit of truth, and Christ is the Truth, and He proceedeth from Him, just as from God the Father.” - St Cyril of Alexandria, The Three Epistles of S. Cyril, Third Letter to Nestorius
Edited and translated by P. E. Pusey, Oxford, 1872
This quote from the Third Letter of St Cyril of Alexandria to Nestorius was approved by the 3rd Ecumenical Council.
“For even if the Spirit exists in his own hupostasis, and moreover is considered by himself insofar as he is the Spirit and not the Son, yet he is not therefore alien from the Son, for he is called the Spirit of truth and Christ is the truth, and the Spirit proceeds from him, just as undoubtedly he also proceeds from God the Father.” - St Cyril of Alexandria, Letter 17:17 (Third Letter to Nestorius)
From: “The Fathers of the Church, St Cyril of Alexandria, Letters 1-50” translated by John I. McEnerney
Nihil obstat: Rev. Michael Slusser, S.T.B., D. Phil. Censor Deputatus
Imprimatur: Rev. Msgr. Raymond Boland, Vicar General for the Archdiocese of Washington
Copyright © 1987 by The Catholic University of America Press, Inc.
Another translation:
“For even though the Spirit exist in His Own Person, and is conceived of by Himself, inasmuch as He is the Spirit and not the Son, yet is He not therefore alien from Him; for He is called the Spirit of truth, and Christ is the Truth, and He proceedeth from Him, just as from God the Father.” - St Cyril of Alexandria, The Three Epistles of S. Cyril, Third Letter to Nestorius
Edited and translated by P. E. Pusey, Oxford, 1872