“On the contrary, where the pure word is not taught, or where there is a weariness and loathing of the word, there the true religion becomes extinguished, and all true worship of God perishes.
“For where the true word of God is not taught, there is not any truth of God; there is found a great noise of external holiness, and the form of godliness, and hypocrisy; there, indeed, is psalm-singing, prayer, doctrines, consolation, thanksgiving, and all the varieties of the worship of God, with all interpretations of the scriptures.
I will add, also, that there you may find sufferings and martyrdoms. But all is outside show; all is the form of godliness only; all is false; all is feigned, and nothing but lies; all is full of the poison of the devil. Nor without true faith in the heart, nor without the divine word, nor without the worship of the First Commandment, is there, or can there be, any true and real worship of God.
From: Luther, Martin. A Manual on the Book of Psalms. Translated by Henry Cole. Lutheran Library 1837/2022. LutheranLibrary.org