Orthodox Wiki - Paul Evdokimov
This fundamental definition resides at the heart of Orthodox eccclesiology. It means that the Eucharist is not a sacrament in the Church but the sacrament of the Church herself. The Eucharist constitutes the Church, manifests and fully experesses her essence. This is why in the Eastern Church the word 'liturgy,' leitourgia: ergon tou laou, literally 'the common work of the people,' is the designation for the entire eucharistic service.
Sacramental and doxological, constitutive and expressive, it is completely natural that down through the centuries the Liturgy has had a most refined pedagogical character and great formative power. Above all it makes us liturgical beings. The human person is a liturgist par excellence, the 'new creature' who says with the psalmist, 'I will sing to my God as long as I live.' Such a person has become a living eucharist. - Chapter 11, The Eucharist - Mystery of the Church of In the World, of the World - A Paul Evdokimov Reader
A Theologian of God's Beauty, A Life of Service by Fr. Michael Plekon
Paul Evdokimov and Olivier Clement