This article has a line that reads:
We would call Luther's approach an evangelical-catholic one.
It cites Paul Tillich's use of "catholic substance" or "protestant principle". Can someone briefly summarize this concept in regards to Luther's approach to conducting liturgies or ceremonial worship? In what ways did Luther criticize the Roman Mass?
Is it trying to talk about Luther's protestant principle in regards to the catholic substance of the Catholic church during Luther's time?
I realize that the following resource may be helpful.
Obedient Rebels: Catholic Substance and Protestant Principle in Luther's Reformation. By Jaroslav Pelikan.
Dr. Pelikan both deepens our understanding of the Lutheran Reformation and contributes greatly to modern ecumenical dialogue. He describes "Catholic substance" as ". . . the body of tradition, liturgy, dogma, and churchmanship developed chiefly by the ancient church and embodied (but not exhausted) for Luther in the Roman Catholic Church of his day." "Protestant Principle" is understood as "the criticism and reconstruction of this Catholic substance . . . carried out in the name of the Christian gospel and with the authority of the Bible." For this union of "Catholic Substance" and "Protestant Principle" resulted the Protestant Reformation.