“Every alteration in the basic creed, each subsidence in the hidden foundations of the Church, ‘which the Lord founded upon the rock of faith,’ produces sooner or later cracks of division on the ‘surface’ of the Church’s face. If dogma is falsified, whether intentionally or not, ecclesiology, both pastoral and administrative, is deformed, spiritual life is falsified an man suffers.
Ecclesiology and Christian anthropology have the same basis: Trinitarian and christological dogma. The Word is made flesh, and theology is ministered in the life of the faithful. Inspired by the Holy Spirit, the theology of the Fathers who proclaimed Christ speaks about our life, which is Christ.
The hypostatic union of the two natures in Christ makes us partakers by grace in the unapproachable life which is in the Holy Trinity. And the mode of existence of God in Trinity forms also the mysterious structure of our own being ‘in the image’. Only when we are conformed to Christ, recognising Him by partaking in His Life, do we ‘regain our proper stature,’ our natural function and our freedom, as the Church and as persons. Ecclesiology and spirituality have the same basis: dogma. The Church is Christ, His body living in history. It is summarised in each of the faithful, who is the Church in miniature. The personal consciousness of each of the faithful has an ecclesial dimension, and every problem of the Church is the problem of the personal salvation of each of the faithful.
Consequently, when the heretic lays hands on the “traditional faith” he lays hands on the life of the faithful, their raison d’être.Heresy is at once a blasphemy towards God and a curse for man. This is the reason why the entire organism and spiritual health and sensitivity of Orthodoxy has from the beginning reacted against the destructive infection of heresies.’
Archimandrite Vasileios in Hymn of Entry pgs 20-21.