The Matthewites under Blessed Andreas of Athens anathematized "Old Calendar Ecumenism" in a 1983 encyclical.
Encyclical of 1983 Against "Old Calendarist Ecumenism"
ACT OF THE HOLY AND SACRED COUNCIL OF THE GENUINE ORTHODOX CHURCH OF GREECE
Protocol Number: 6/13-7-1983
Theme: Condemnation of the so-called "Old Calendarist Ecumenism."
The Holy Synod of Bishops of the Genuine Orthodox Church of Greece in its session of July 13, 1983, addressed the theme of the so-called "Old Calendarist Ecumenism", and took into account:
a) That the so-called "Old Calendarist Ecumenism" teaches an entirely heretical teaching, to wit, that all the groups and factions that follow the old calendar together consist and belong to the One, Holy, Catholic and Apostolic Church of Christ, and it proposes a union of these [factions] according to an ecumenistic perception and not according to the Orthodox Confession and Ecclesiology.
b) That "Old Calendarist Ecumenism" is a fruit and product of antichristian Ecumenism, the pan-heresy of our age, which seeks, through the fractions and divisions and the ecclesiological confusion, to distort the Orthodox Confession – Ecclesiology and to introduce this heretical teaching into the Uninnovated Church, in order to thereby suffocate it.
c) That the age, in which we are going through, is an age of general apostasy and ecclesiological confusion, which was caused by antichristian Ecumenism. Thus, the criticality of these times requires [from us] especially, a continuous way of life in the pure Confession of the Orthodox Faith and in the teachings of the Church of Christ.
d) That "the chosen vessel," the divine Apostle Paul, commands us all: "Take heed therefore unto yourselves, and to all the flock, over the which the Holy Spirit hath made you overseers, to feed the church of God, which he hath purchased with his own blood," and continues: "grievous wolves shall enter in among you, not sparing the flock. Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them." (Acts 20:28-30)
e) That many have arisen, speaking perversely, for the purpose of setting aside the Confession and Ecclesiology of the Holy Church of Christ, and turn against the divine and Sacred Canons and generally against the Holy and Sacred Tradition, by preaching "Old Calendarist Ecumenism" with bared head, and disturbing the assembly of the faithful.
Since "Old Calendarist Ecumenism" is condemned by the consensus of the divine and Sacred Canons and is something foreign and polemical against the Orthodox Confession and Ecclesiology of the Church of Christ, for this reason, together with our Holy and God-bearing Fathers, holding the divine and Sacred Canons in embrace, in the Holy Spirit we decide:
We judge and condemn the so-called “Old Calendarist Ecumenism,” as something foreign to, and incompatible with, the Orthodox Confession and Ecclesiology of the Holy Church of Christ.
With one mouth and one heart we confess and preach that the Genuine Orthodox Church, which for reasons of discernment is called "uninnovated" or "Church of the Genuine Orthodox Christians," is the continuation of the One, Holy, Catholic and Apostolic Church of Christ, from which [the following] were torn off: firstly, the innovated new calendarist church, through the introduction of the condemned papist innovation [of the calendar], by which Ecumenism entered in 1924; and secondly, the various old calendarist schisms, which were created by their distortion of the Confession – Ecclesiology of the uninnovated Holy Church of Christ.
This Orthodox Confession – Ecclesiology was printed and preached since 1924, and was Synodically preached in the historic year of 1935. We also keep it, preach it and confess it.
With one voice we disapprove and remove any expressions or publications which, regardless of what context or by whom they were written, are unacceptable from an Orthodox perspective and are foreign to the Orthodox Confession and Ecclesiology, and we order that from now on, anything contradictory, whether it be due to carelessness or through human weakness, we regard it as having not been written.
In the year of salvation 1983, on July the 13th (old calendar).
The President:
- ANDREW of Athens and all Greece
The Members:
- GREGORY of Messenia
- MATTHEW of Megaris
- LAZARUS of Bresthena
- PACHOMIUS of Argolis
- THEODOSIUS of Phthiotis
- TITUS of Kozane
The Chief Secretary
- Hieromonk Kirykos (Kontogiannis)
To understand this encyclical in its context, we have to realize that in 1983, the True Orthodox in Greece were in crisis. The Florinites had divided into the Auxentiites and the Kallisties, and the Kallistes had further divided into two groups headed by Gerontios of Piraeus and Anthony of Megara. The next year, in 1984, the Synod in Resistance was formed by Metropolitan Cyprian of Fili. There was considerable confusion regarding who was in communion with whom, and clarification was needed on the issue of True Orthodox ecclesiology. There was a lot of ambiguity as to whether it was okay to be in communion with the World Orthodox local churches that followed the Patristic Calendar, such as Serbia and Jerusalem. The ROCOR had severed communion with the Belgrade Patriarchate in 1967, and Metropolitan Philaret personally censured several clergy who continued to concelebrate with Serbian clergymen. ROCOR was still in communion with Jerusalem, however, and the Metropolitan Cyprian's synod would also go on to establish communion with Jerusalem. With all this in mind, the only synod that would have fallen under this anathema was the Synod in Resistance (which no longer exists). To my knowledge, there is no True Orthodox synod existing today that would fall under this anathema.