Background:
Two books I read that really became lightbulb moments for me with regard to the filioque were Aristotle East and West and Crisis in Byzantium. To understand the dispute, a person must be willing to slog through a certain amount of philosophy because the theology in question is expressed using very dense philosophical language. These books will help with that.
When we're talking about the men who expressed our theology, many were trained in logic, dialectic, philosophy, etc. Some the greatest saints, east and west, began their lives and journeys to Christ in pagan (what we today would call secular) schools -- men such as St Augustine of Hippo and St John Chrysostom. Others were highly trained as members of imperial courts or wealthy families (St Maximos the Confessor, St Gregory Palamas, St Gregory the Theologian, St John of Damascus etc). When defending points, these men were writing with the precision of language that is not dissimilar to the precision required in mathematics or other modern disciplines. They were, in many cases, the most intelligent men of their age, educated at the highest level.
As such, we need to take great care to understand their words and not to read them carelessly. There were extensive debates over seemingly trifling differences (sometimes single letters!) at many of the councils -- by this we can know that the fathers understood two things:
1. That there is a certain element of reverence, piety, and risk associated with expressing ineffable truths.
2. That the things we say and confess are of the utmost importance.
Why? Because something which can be expressed through logic, if false, can be proven false through logic. So, when faced when describing the indescribable and the necessary paradox, to ensure their words were salvific, they were careful to not speak in error. Many of the fathers talk of this difficulty and how extremely careful they were. St Gregory Nazienzen said "Not to every one, my friends, does it belong to philosophize about God; not to every one; the Subject is not so cheap and low; and I will add, not before every audience, nor at all times, nor on all points; but on certain occasions, and before certain persons, and within certain limits." He continues here. It's worth a read.
With that being said, in the 1200s there was a council held at Constantinople. A man by the name of John Beccus had been made Patriarch, who was, apparently, genuinely convinced that the Latin interpretation of the filioque was both pious and an authentic tradition. He taught this for some eight years. His successor, Gregory II, wound up in a council to debate the fact. You can read more about Blachernae in the book Crisis in Byzantium. Long story short, Patriarch Gregory wrote the following against the position of Beccus. Beccus' theology supporting the filioque hinged on the words through and from as equivalent. However, the council of Blachernae rejected this theology as error. Patriarch Gregory's writings heavily influenced St Gregory Palamas in his Triads and other writings which form the basis of much of his defense of the mystical life of the church against Barlaam -- this conflict was essentially the battle between the western Scholastic theology and the eastern mystical theology. One might say this is mysticism versus intellectualism. (Fun fact, the disagreement between them began in Barlaam's attack against the filioque, which wound up suggesting that God was unknowable so we couldn't know whether the Spirit proceeds from the Father, or the Son, or both.)
Here is Patriarch Gregory's Tomus against Beccus. It is Orthodox in its confession and answers any and all claims I have seen. I have taken the main points describing the error of Beccus, and thus the council's refutation of the filioque. This is not the total of the writings of the repudiation of it; St Photios wrote extensively against it, as did St Mark of Ephesus and others. But, it's a simple and easy read.
http://oodegr.co/english/oikoumenismos/filioque_beccus.htm
Edit: Cut it down to a summary and quotes, removed some points, etc.
3. The basic objection to the filioque is addressed, because by "requiring" the Son in the cause of the spirit they remove the monarchy of the Father. Beccus and others appealed to a quote of St John of Damascus "He Himself [the Father], then, is mind, the depth of reason, begetter of the Word, and, through the Word, projector of the manifesting Spirit." The debate became one of small words: through, of from, etc. However, St John in the same chapter wrote that the only cause in the Trinity is God the Father "thus denying, by the use of the word 'only,' the causative principle to the remaining two hypostases." St John also said "and we speak, likewise, of the Holy Spirit as the 'Spirit of the Son,' yet we do not speak of the Spirit as from the Son."
4. This chapter is a "new" bit of theology from Gregory II, defining the tricky distinction between temporal manifestation (sending, etc) and eternal subsistence (proceeding). Beccus and others also quote the phrase "the Spirit exists through the Son and from the Son." In certain texts [of the Fathers], the phrase denotes the Spirit's shining forth and manifestation. Indeed, the very Paraclete shines form and is manifest eternally through the Son, in the same way that light shines forth and is manifest through the intermediary of the sun's rays; it further denotes the bestowing, giving, and sending of the Spirit to us. It does not, however, mean that it subsists through the Son and from the Son, and that it receives its being through Him and from Him.
5. This chapter addresses the use of the word through vs from in Greek. Beccus suggested that "through" and "from" were equivalent, so the filique was in alignment with Patristic texts which used "through the Son". The answer was "If, in fact, it is also said by some of the saints that the Spirit proceeds 'through the Son,' what is meant here is the eternal manifestation of the Spirit by the Son, not the purely [personal] emanation into being of the Spirit, which has its existence from the Father." St Gregory Nazianzus is quoted as a reference: "everything the Father is said to possess, the Son, likewise, possesses except causality."
6. Chapter 6 clarifies the distinction between the essence or nature and the hypostasis. This addresses the common Western addition of the filioque "as from one source" implying that the Spirit comes from the common Essence and Divinity. " The common essence and nature is not the cause of the hypostasis; nor does this common essence ever generate or project that which is undivided." St Maximos the Confessor is referenced to support that it's the other way around the essence plus an individual characteristic is what denotes each hypostasis. St Basil the Great is also referenced that the hypostasis is defined as what describes that is common to the essence AND which cannot be described by the individual characteristics. Thus, Gregory II writes, "the indivisible essence always projects something indivisible (or generates the indivisible that generates)" which is also a reference to St John of Damascus.
7. Next, the meaning of the word "through" in "from the Father through the Son" is discussed. Depending on the phrasing, you could see that there's a variance in which is THE cause "with the result that sometimes they believe and say that the Father is cause, and sometimes the Son. This being so, they introduce a plurality and a multitude of causes in the procession of the Spirit."
8. Chapter 8 discusses the idea that the Father causes the Spirit by the Essence and not the Hypostasis which requires the Son to be the cause of the Spirit, since the Son is "of one Essence with the Father". But this is "absurd" because the Spirit is also God, so is also of the same Essence. So the Spirit must have causality by the same argument as the Son. And, the Spirit must cause itself, being part of the Essence. Third, that we've again removed the monarchy of the Father, because now the Essence is the cause and not the Persons.
9. Chapter 9 addresses the difference between by and through for how the Father created by or through the Son. The argument was that the Father was the maker of all things, by or through the Son; and this was the same as the Spirit. But this is fraught with theological problems (is the Spirit a creation?) It also has a refutation: "In reality, even if the Son, like the Father, is creator of all things made 'through Him,' it does not follow that He is also the Spirit's cause, because the Father is the projector of the Spirit through Him; nor, again, does it follow that, because the Father is the Spirit's projector 'through the Son,' He is, through Him, the cause of the Spirit."
10. This answers an argument that says that the Theotokos is the fountain of life to Christ the same way the Son is the fountain of life to the Spirit. However, this is an "incongruous comparison" because Christ really got his living flesh, his humanity from the Virgin Mary. In this way, she really was the cause of His flesh. This reflects the dual nature of Christ: fully God and Fully man. So how can we compare this to the Spirit? Is it half-Father and half-Son?
////
After these ten points, there is a list of rhetorical questions a demand for patristic authority to back the change to the creed that is ecumenical.
////
Finally a note about the reason for excommunication:
Two books I read that really became lightbulb moments for me with regard to the filioque were Aristotle East and West and Crisis in Byzantium. To understand the dispute, a person must be willing to slog through a certain amount of philosophy because the theology in question is expressed using very dense philosophical language. These books will help with that.
When we're talking about the men who expressed our theology, many were trained in logic, dialectic, philosophy, etc. Some the greatest saints, east and west, began their lives and journeys to Christ in pagan (what we today would call secular) schools -- men such as St Augustine of Hippo and St John Chrysostom. Others were highly trained as members of imperial courts or wealthy families (St Maximos the Confessor, St Gregory Palamas, St Gregory the Theologian, St John of Damascus etc). When defending points, these men were writing with the precision of language that is not dissimilar to the precision required in mathematics or other modern disciplines. They were, in many cases, the most intelligent men of their age, educated at the highest level.
As such, we need to take great care to understand their words and not to read them carelessly. There were extensive debates over seemingly trifling differences (sometimes single letters!) at many of the councils -- by this we can know that the fathers understood two things:
1. That there is a certain element of reverence, piety, and risk associated with expressing ineffable truths.
2. That the things we say and confess are of the utmost importance.
Why? Because something which can be expressed through logic, if false, can be proven false through logic. So, when faced when describing the indescribable and the necessary paradox, to ensure their words were salvific, they were careful to not speak in error. Many of the fathers talk of this difficulty and how extremely careful they were. St Gregory Nazienzen said "Not to every one, my friends, does it belong to philosophize about God; not to every one; the Subject is not so cheap and low; and I will add, not before every audience, nor at all times, nor on all points; but on certain occasions, and before certain persons, and within certain limits." He continues here. It's worth a read.
With that being said, in the 1200s there was a council held at Constantinople. A man by the name of John Beccus had been made Patriarch, who was, apparently, genuinely convinced that the Latin interpretation of the filioque was both pious and an authentic tradition. He taught this for some eight years. His successor, Gregory II, wound up in a council to debate the fact. You can read more about Blachernae in the book Crisis in Byzantium. Long story short, Patriarch Gregory wrote the following against the position of Beccus. Beccus' theology supporting the filioque hinged on the words through and from as equivalent. However, the council of Blachernae rejected this theology as error. Patriarch Gregory's writings heavily influenced St Gregory Palamas in his Triads and other writings which form the basis of much of his defense of the mystical life of the church against Barlaam -- this conflict was essentially the battle between the western Scholastic theology and the eastern mystical theology. One might say this is mysticism versus intellectualism. (Fun fact, the disagreement between them began in Barlaam's attack against the filioque, which wound up suggesting that God was unknowable so we couldn't know whether the Spirit proceeds from the Father, or the Son, or both.)
Here is Patriarch Gregory's Tomus against Beccus. It is Orthodox in its confession and answers any and all claims I have seen. I have taken the main points describing the error of Beccus, and thus the council's refutation of the filioque. This is not the total of the writings of the repudiation of it; St Photios wrote extensively against it, as did St Mark of Ephesus and others. But, it's a simple and easy read.
http://oodegr.co/english/oikoumenismos/filioque_beccus.htm
Edit: Cut it down to a summary and quotes, removed some points, etc.
3. The basic objection to the filioque is addressed, because by "requiring" the Son in the cause of the spirit they remove the monarchy of the Father. Beccus and others appealed to a quote of St John of Damascus "He Himself [the Father], then, is mind, the depth of reason, begetter of the Word, and, through the Word, projector of the manifesting Spirit." The debate became one of small words: through, of from, etc. However, St John in the same chapter wrote that the only cause in the Trinity is God the Father "thus denying, by the use of the word 'only,' the causative principle to the remaining two hypostases." St John also said "and we speak, likewise, of the Holy Spirit as the 'Spirit of the Son,' yet we do not speak of the Spirit as from the Son."
4. This chapter is a "new" bit of theology from Gregory II, defining the tricky distinction between temporal manifestation (sending, etc) and eternal subsistence (proceeding). Beccus and others also quote the phrase "the Spirit exists through the Son and from the Son." In certain texts [of the Fathers], the phrase denotes the Spirit's shining forth and manifestation. Indeed, the very Paraclete shines form and is manifest eternally through the Son, in the same way that light shines forth and is manifest through the intermediary of the sun's rays; it further denotes the bestowing, giving, and sending of the Spirit to us. It does not, however, mean that it subsists through the Son and from the Son, and that it receives its being through Him and from Him.
5. This chapter addresses the use of the word through vs from in Greek. Beccus suggested that "through" and "from" were equivalent, so the filique was in alignment with Patristic texts which used "through the Son". The answer was "If, in fact, it is also said by some of the saints that the Spirit proceeds 'through the Son,' what is meant here is the eternal manifestation of the Spirit by the Son, not the purely [personal] emanation into being of the Spirit, which has its existence from the Father." St Gregory Nazianzus is quoted as a reference: "everything the Father is said to possess, the Son, likewise, possesses except causality."
6. Chapter 6 clarifies the distinction between the essence or nature and the hypostasis. This addresses the common Western addition of the filioque "as from one source" implying that the Spirit comes from the common Essence and Divinity. " The common essence and nature is not the cause of the hypostasis; nor does this common essence ever generate or project that which is undivided." St Maximos the Confessor is referenced to support that it's the other way around the essence plus an individual characteristic is what denotes each hypostasis. St Basil the Great is also referenced that the hypostasis is defined as what describes that is common to the essence AND which cannot be described by the individual characteristics. Thus, Gregory II writes, "the indivisible essence always projects something indivisible (or generates the indivisible that generates)" which is also a reference to St John of Damascus.
7. Next, the meaning of the word "through" in "from the Father through the Son" is discussed. Depending on the phrasing, you could see that there's a variance in which is THE cause "with the result that sometimes they believe and say that the Father is cause, and sometimes the Son. This being so, they introduce a plurality and a multitude of causes in the procession of the Spirit."
8. Chapter 8 discusses the idea that the Father causes the Spirit by the Essence and not the Hypostasis which requires the Son to be the cause of the Spirit, since the Son is "of one Essence with the Father". But this is "absurd" because the Spirit is also God, so is also of the same Essence. So the Spirit must have causality by the same argument as the Son. And, the Spirit must cause itself, being part of the Essence. Third, that we've again removed the monarchy of the Father, because now the Essence is the cause and not the Persons.
9. Chapter 9 addresses the difference between by and through for how the Father created by or through the Son. The argument was that the Father was the maker of all things, by or through the Son; and this was the same as the Spirit. But this is fraught with theological problems (is the Spirit a creation?) It also has a refutation: "In reality, even if the Son, like the Father, is creator of all things made 'through Him,' it does not follow that He is also the Spirit's cause, because the Father is the projector of the Spirit through Him; nor, again, does it follow that, because the Father is the Spirit's projector 'through the Son,' He is, through Him, the cause of the Spirit."
10. This answers an argument that says that the Theotokos is the fountain of life to Christ the same way the Son is the fountain of life to the Spirit. However, this is an "incongruous comparison" because Christ really got his living flesh, his humanity from the Virgin Mary. In this way, she really was the cause of His flesh. This reflects the dual nature of Christ: fully God and Fully man. So how can we compare this to the Spirit? Is it half-Father and half-Son?
////
After these ten points, there is a list of rhetorical questions a demand for patristic authority to back the change to the creed that is ecumenical.
Quote:
For where have the God-bearing Fathers said that God the Father is, through the Son, the cause of the Spirit? Where do they say that the Paraclete has its existence from the Son and through the Son? Again, where do they say that the same Paraclete has its existence from the Father and from the Son? In what text do they teach that the one essence and divinity of the Father and the Son is the cause of the Holy Spirit's existence? Who, and in which of his works, ever prohibited anyone from saying that the hypostasis of the Father is the unique cause of being of the Son and the Spirit? Who among those who believe that the Father is the cause of the Spirit has taught that this is by virtue of the nature, not by virtue of the hypostasis? And who has failed to maintain this as the characteristic that distinguishes the Father from the other two hypostases?
////
Finally a note about the reason for excommunication:
Quote:
And although we excommunicate them, separate them from the Church of the devout, impose on them the awesome and great judgment of separation and estrangement from the Orthodox, we do not do it because we wish to exult over their misfortune or to rejoice over their rejection. On the contrary, we grieve and bear their isolation with loathing. But why do we need to act in this fashion? Mainly for two reasons: the first being that their unhappiness and bitterness will cause them, after they have realized their folly, to return repentant and save themselves in the Church. Secondly, others will henceforth be chastened and disciplined so as not to attempt anything similar, or attack that which is holy, or behave willfully against that which is sacred; lest, if they show such audacity, they receive the same rewards in accordance with the example that has been set.