Analysis of information sources in references of the Wikipedia article "Ordinary (liturgy)" in English language version.
The Lutheran Church is a liturgical church because it is an orthodox church. Its historic worship forms are thoroughly Biblical and evangelical in content, and therefore serve as faithful guides in orthodox Christian worship. The chief articles of Christian doctrine (the Trinity, the person and work of Christ, sin and grace, etc.) are deeply embedded in the unchanging parts of the Service (the Ordinary), and they become deeply embedded in the minds and hearts of Christian worshipers through the disciplined, weekly repetition of those texts. (The Ordinary of the Mass includes the Kyrie, Gloria in Excelsis, Nicene Creed, Sanctus, and Agnus Dei.)
Liturgy in the broad sense covers all that was said or sung or performed in church in the past. However, I speak of liturgy in a more restricted sense of the word, limiting myself to the ordinary liturgy, such as the Liturgy of the Mass, the Rituals and the Liturgy of Hours [emphasis added].
