The Laitn idea of stain is basically what Anselm stated, the loss of original justice or holiness. The council of Trent speaks of it in its decrees on Original Sin. You could also define it as the loss of sanctifying Grace.
But with regards to the Doctrine of Original Sin, it would appear Dogmatized by the Councils (both at the regional synod level and also by two Ecumenical Councils. In my inquiry into ‘modern’ Orthodoxy I find weird inconsistencies with the Councils and their own Theologians which really concerned me and ultimately kept me from further inquiry.
The Councils on Original Sin:
Council of Mileum II 416, Approved by Innocent and Council of Carthage (XVI) 418, Approved by Zosimus against the Pelagians
The First Canon States:
All the bishops established in the sacred synod of the Carthaginian Chruch have decided that whoever says that Adam, the first man, was made mortal, so that, whether he sinned or whether he did not sin, he would die in body, that is he would go out of the body not because of the merit of sin but by reason of the necessity of nature, let him be anothema.
The Second Canon states:
Likewise it has been decided that whoever says that infants fresh from their mothers’ wombs ought not to be baptized, or says that they are indeed baptized unto the remission of sins, but that they draw nothing of the original sin from Adam, which is expiated in the bath of regeneration, whence it follows that in regard to them the form of baptism “unto the remission of sins” is understood as not true, but as false, let him be anathema. Since what the Apostle says: “Though one man sin entered into the world (and through sin death), and so passed into all men, in whom all have sinned” [cf. Romans 5:12], must not to be understood otherwise than as the Catholic Church spread everywhere has always understood it. For on account of this rule of faith even infants, who in themselves thus far have not been able to commit any sin, are therefore truly baptized unto the remission of sins, so that that which they have contracted from generation may be cleansed in them by regeneration.
These Carthaginian canons were accepted by the Church at the Ecumenical Council in AD 431. They were received yet again at the Seventh Ecumenical Council (the Second Council of Nicea) in AD 787. These Canons were and ‘must not to be understood otherwise than as the catholic and apostalic Church spread everywhere has always understood it.’
Teachings of an Orthodox Theologian:
Nor does this resemble the works of Simeon the New Theologian (i.e. The First-Created Man, Seven Homilies) who clearly presents the ‘orthodox’ teaching of “Original Sin”…
In the present life no one has the divine power in himself to manifest a brilliant glory, and there is no one who is clothed with glory before humility and disgrace; but every man who is born in this world is born inglorious and insignificant, and only later, little by little, advances and becomes glorious.
Therefore, if anyone, having experienced beforehand such disgrace and insignificance, shall then become proud, is he not senseless and blind? That saying that calls no one sinless except God, even though he has lived only one day on earth, does not refer to those who sin personally, because how can a one-day old child sin? But in this expressed that mystery of our Faith, that human nature is sinful from its very conception. God did not create man sinful, but pure and holy. But since the first-created Adam lost this garment of sanctity, not from any other sin but from pride alone, and became corruptible and mortal, all people also who come from the seed of Adam are participants of the ancestral sin from their very conception and birth. He who has been born in this way, even though he has not yet performed any sin, is already sinful through this ancestral sin. - The First-Created Man: Homily 37 The Ancestral (Original) Sin and Our Regeneration by St. Symeon The New Theologian
I find the underlined very concerning for the modern Orthodox argument that Original Sin was understood in some vague philosophical way as it appears to be now by modern Orthodox apologists. Even if we look to On the Incarnation by St. Athanasius we find comparing our original state of grace in immortality with a new state in death needing ‘rebirth’ to renew. I simply don’t find the “modern” Orthodox apologetic
in history and that really concerns me because they appear to have emphasized the Cappadocian Fathers over the consensus of the whole faith in order to present an alternative to historic Catholic Theology. Now I don’t pretend to think that everything in the Catholic Church is as it has always been… but I do get the feeling that “modern” Orthodoxy has artificially contrived distinctions in order to appeal to modern sentiment concerning these teachings (particularly that of modern liberal protestant views concerning the need for Baptism etc.).