The word liturgy means common work or common action. The Divine Liturgy is the common work of the Orthodox Church. It is the official action of the Church formally gathered together as the chosen People of God. The word church, as we remember, means a gathering or assembly of people specifically chosen and called apart to perform a particular task.
The Divine Liturgy is the common action of Orthodox Christians officially gathered to constitute the Orthodox Church. It is the action of the Church assembled by God in order to be together in one community to worship, to pray, to sing, to hear God’s Word, to be instructed in God’s commandments, to offer itself with thanksgiving in Christ to God the Father, and to have the living experience of God’s eternal kingdom through communion with the same Christ Who is present in his people by the Holy Spirit.
The Divine Liturgy is always done by Orthodox Christians on the Lord’s Day which is Sunday, the “day after Sabbath” which is symbolic of the first day of creation and the last day—or as it is called in Holy Tradition, the eighth day—of the Kingdom of God. This is the day of Christ’s resurrection from the dead, the day of God’s judgment and victory predicted by the prophets, the Day of the Lord which inaugurates the presence and the power of the “kingdom to come” already now within the life of this present world.
The Divine Liturgy is also celebrated by the Church on special feast days. It is usually celebrated daily in monasteries, and in some large cathedrals and parish churches, with the exception of the week days of Great Lent when it is not served because of its paschal character.
As the common action of the People of God, the Divine Liturgy may be celebrated only once on any given day in an Orthodox Christian community. All of the members of the Church must be gathered together with their pastor in one place at one time. This includes even small children and infants who participate fully in the communion of the liturgy from the day of their entrance into the Church through baptism and chrismation. Always everyone, always together. This is the traditional expression of the Orthodox Church about the Divine Liturgy.