The Athanasian Creed was developed to combat Arianism (which denied Christ's divinity and continued to circulate after the Councils of Nicea and Constantinople), Monophysitism (which reduced Christ to one nature), and Nestorianism (which separated his natures). It very much emphasises the Trinity. Now and again I'll recite it but certainly not from memory, as it is too long for that and not in popular usage.
Actually there’s nothing in the Quincunque Vult (sometimes incorrectly called the Athanasian Creed) that would thwart what most people erroneously call monophysites (the miaphysite Oriental Orthodox) or Nestorians. Monophysitism is extinct; the Oriental Orthodox were never monophysites, and indeed Pope Dioscorus anathematized Eutyches, the Monophysite heresiarch, but this did not prompt him from being falsely accused of monophysitism by the crypto-Nestorian Ibas at Chalcedon, or being deposed, which was unfortunate. One wishes that the early church had listened to Archbishop Leo in his desire that a fourth ecumenical council not happen, but alas, it didn’t. Now with regards to the actual Monophysites, the Eutychians, they became Tritheists due to their idea of the human nature dissolving into the divine nature of Christ “like a drop of water into the ocean” making Him ontologically different from the Father and the Spirit, thus their actual successors are the Mormons, who are also Tritheists, and Quincunque Vult does preclude that. But nothing in it precludes the Miaphysite Christology, because the Oriental Orthodox believe, as do Chalcedonians, that the divinity of Christ in the Incarnation was united with his humanity without change, confusion, separation or division. The only difference is they use the phrase “from two natures” rather than “in two natures,” however, like Chalcedonians, they confess a hypostatic union. For this reason the Antiochian Orthodox (EO) and Syriac Orthodox (OO) churches have an ecumenical agreement which extends to the two churches not even converting members of the one church to the other, and allowing intercommunion, although unfortunately this does not extend to autonomous archdioceses such as the Antiochian Orthodox Church in North America, which was formerly part of the Russian Orthodox Church led by a Syrian emigre bishop, St. Rafael of Brooklyn, which became autocephalous during the fragmentation of the Russian Orthodox Church after the death of St. Tikhon in brutal Soviet captivity. The process of EO-OO reunification has concluded theological dialogue and the pastoral and administrative integration is being promoted by IOTA (the International Orthodox Theological Association)
Hierarch Members - International Orthodox Theological Association
Unfortunately, a number of English speaking Eastern Orthodox are unaware of the progress being made despite Metropolitan Kallistos Ware, memory eternal, having discussed it in his book, and believe Oriental Orthodox are monophysite heretics; likewise, some Ethiopian Orthodox have the opposite view, that all Chalcedonians are Nestorians (some of the monasteries hold to this view); I have also encountered, on ChristianForums, a member of the Armenian church who held to this view and also regarded some OO doctrines emphasized in the Syriac and Coptic churches as heretical despite the fact that this would make his own hierarchs guilty of being in communion with an heretical church (at one time Armenia did have a schism with the Syriac Orthodox over this issue, but that schism was resolved many many centuries ago, which is the one danger of people reading some Patristic documents out of context, in that they might assume the issues raised in them are still current issues).
As far as Nestorianism is concerned, it persists, but not in the Assyrian Church of the East, which replaced it with what could be called “Syro-Chalcedonian” Christology during the tenure of Mar Babai the Great as Catholicos of the East; in 1975 under the patriarchate of Catholicos Mar Dinkha IV, memory eternal, the Assyrian Church of the East, by this time divided by a schism from the smaller Ancient Church of the East over the last hereditary Catholicos changing the calendar to the Gregorian (and also an Indian bishop of the church discovering the ancient canons, well known to the Eastern and Oriental Orthodox, and the Roman Catholic Church that preclude a bishop from choosing his own successor, thus making a hereditary episcopal office impossible under the Apostolic Canons; hopefully these canons were translated into the canon law systems Rome created to replace their nomocanon known as the Decretals, an assembly of canon law similar to the Eastern Orthodox Pedalion).
There are two versions of Quincunque Vult, the one familiar to most members contains the Filioque, but another version, which I suspect is the original, lacks it, and is divided into two sections rather than three, and is included in Russian Orthodox Psalters and A Psalter for Prayer, also known as the Jordanville Psalter, published by Holy Trinity Monastery of ROCOR; according to Metropolitan Kallistos Ware, memory eternal, who would know, it is also in some editions of the Greek Orthodox Horologion. Its text is as follows:
The Athanasian Creed
WHOSOEVER will be saved, before all things it is necessary that he hold the Catholic Faith. Which Faith except every one do keep whole and undefiled, without doubt he shall perish everlastingly. And the Catholic Faith is this, That we worship one God in Trinity, and Trinity in Unity; neither confounding the Persons, nor dividing the Substance. For there is one Person of the Father, another of the Son, and another of the Holy Spirit. But the Godhead of the Father, of the Son, and of the Holy Spirit, is all one, the Glory equal, the Majesty co-eternal. Such as the Father is, such is the Son, and such is the Holy Spirit. The Father uncreate, the Son uncreate, and the Holy Spirit uncreate. The Father incomprehensible, the Son incomprehensible, and the Holy Spirit incomprehensible. The Father eternal, the Son eternal, and the Holy Spirit eternal. And yet they are not three eternals, but one eternal. As also there are not three incomprehensibles, nor three uncreated, but one uncreated, and one incomprehensible. So likewise the Father is Almighty, the Son Almighty, and the Holy Spirit Almighty. And yet they are not three Almighties, but one Almighty. So the Father is God, the Son is God, and the Holy Spirit is God. And yet they are not three Gods, but one God. So likewise the Father is Lord, the Son Lord, and the Holy Spirit Lord. And yet not three Lords, but one Lord. For like as we are compelled by the Christian verity, to acknowledge every Person by Himself to be God and Lord; so are we forbidden by the Catholic Religion, to say, There be three Gods, or three Lords. The Father is made of none, neither created, nor begotten. The Son is of the Father alone, not made, nor created, but begotten. Likewise also the Holy Spirit is of the Father, neither made, nor created, nor begotten, but proceeding. So there is one Father, not three Fathers; one Son, not three Sons; one Holy Spirit, not three Holy Spirits. And in this Trinity none is afore, or after other, none is greater, or less than another; but the whole three Persons are co-eternal together, and co- equal. So that in all things, as is aforesaid, the Unity in Trinity, and the Trinity in Unity is to be worshipped. He therefore that will be saved, must thus think of the Trinity.
Concerning Christ
FURTHERMORE, it is necessary to everlasting salvation, that he also believe rightly the Incarnation of our Lord Jesus Christ. For the right Faith is, that we believe and confess that our Lord Jesus Christ, the Son of God, is God and Man; God, of the Substance of the Father, begotten before the ages, and Man, of the Substance of His Mother, born in the world; perfect God, and perfect Man, of a reasonable soul and human flesh subsisting; equal to the Father, as touching His Godhead, and inferior to the Father, as touching His Manhood. Who, although He be God and Man, yet He is not two, but one Christ; one; not by conversion of the Godhead into flesh, but by taking of the Manhood into God; one altogether; not by confusion of Substance, but by unity of Person. For as the reasonable soul and flesh is one man, so God and Man is one Christ; Who suffered for our salvation, descended into hell, rose again the third day from the dead. He ascended into heaven; He sitteth on the right hand of the Father, God Almighty, from whence He shall come to judge the living and the dead. At whose coming all men shall rise again with their bodies, and shall give account for their own works. And they that have done good shall go into life everlasting, and they that have done evil into everlasting fire. This is the Catholic Faith, which except a man believe faithfully, he cannot be saved.