Sixth, the holy Christian people are externally recognized by prayer, public praise, and thanksgiving to God. Where you see and hear the Lord’s Prayer prayed and taught; or psalms or other spiritual songs sung, in accordance with the word of God and the true faith; also the creed, the Ten Commandments, and the catechism used in public, you may rest assured that a holy Christian people of God are present. For prayer, too, is one of the precious holy possessions whereby everything is sanctified, as St. Paul says [I Tim. 4:5]. The psalms too are nothing but prayers in which we praise, thank, and glorify God. The creed and the Ten Commandments are also God’s word and belong to the holy possession, whereby the Holy Spirit sanctifies the holy people of Christ. However, we are now speaking of prayers and songs which are intelligible and from which we can learn and by means of which we can mend our ways. The clamor of monks and nuns and priests is not prayer, nor is it praise to God; for they do not understand it, nor do they learn anything from it; they do it like a donkey, only for the sake of the belly and not at all in quest of any reform or sanctification or of the will of God. (Luther’s Works, v.41, p.164)
Picture: Veronica window: The Face of Jesus