OK I think I have a lead on this notion that was passed on to me by a priest:
it seems he was referring to St Gregory of Nyssa:
http://logismoitouaaron.blogspot.kr/201 ... ry-of.html
The above link is an article by a ROCOR (MP?) blogger deacon who asks if St Mark of Ephesus believed St Gregory of Nyssa was in Error on the issue of "Origenistic apokatastasis" and it seems many Orthodox theologians are now saying that he was guilty of that error. The linking of St. Gregory to Origen seems to ring a bell. It is just that I had heard that so long ago that I have not got all the details in mind any more.
Anyways, the article says this in one place:
"...in Fr Seraphim’s The Place of Blessed Augustine in the Orthodox Church...In the context of his study of St Augustine, Fr Seraphim is concerned to show that, according to the Orthodox Tradition, it is possible for a Saint and Father of the Church to err."
Also, there is this shortish quote from St. Mark of Ephesus who examined the teaching of St Gregory of Nyssa's teaching on the Fire and hell and "purgatory" or a cleansing fire:
"With regard to the words which are quoted of the blessed Gregory of Nyssa [by the Latins arguing for their doctrine of Purgatory], it would be better to give them over to silence, and not at all compel us, for the sake of our own defense, to bring them out into the open. For this Teacher is seen to be clearly in agreement with the dogmas of the Origenists and to introduce an end to torments.’ According to St Gregory (St Mark continues), ‘there will come a final restoration of all, and of the demons themselves, “that God”, he says, “may be all in all”, as the Apostle says. Inasmuch as these words have also been quoted, among others, at first we shall reply regarding them as we have received it from our Fathers. It is possible that these are alterations and insertions by certain heretics and Origenists. . . . But if the Saint was actually of such an opinion, this was when this teaching was a subject of dispute and had not been definitely condemned and rejected by the opposite opinion, which was brought forward at the Fifth Ecumenical Council; so that there is nothing surprising in the fact that he, being human, erred in precision (of truth), when the same thing happened also with many before him, such as Irenaeus of Lyons and Dionysius of Alexandria and others. . . . Thus, these utterances, if they were actually said by the marvellous Gregory concerning that fire, do not indicate a special cleansing [such as purgatory would be—ed. note], but introduce a final cleansing and a final restoration of all; but in no way are they convincing for us, who behold the common judgment of the Church and are guided by the Divine Scriptures, but not beholding what each of the Teachers has written as his personal opinion. And if anyone else has written otherwise about a cleansing fire, we have no need to accept it’ (‘First Homily on Purgatorial Fire", ch. 11; Pogodin, pp. 68-9). [4]
Anyways, the blog article compares this interpretation of St Gregory of Nyssa's words on the topic with Hierotheos Vlachos' book that seeks to clear St Gregory of that charge. Quotes from that point of view are also included, but I will not quote it here for then we would be copying practically the entire article.