And since twenty is less than thirty-five, perhaps I can shamelessly attempt again to kickstart some discussion and debate of my theses on the Liturgy and adiaphora.
To that end, here are twenty theses that drive to the heart of my own wrestling with what is given and what is free in the Church's administration and reception of the Divine Liturgy (I've left the enumeration intact, in order to tease the reader into reading more, and for the sake of my own sanity in keeping track of things):
1. The Divine Liturgy, properly speaking (Apology XXIV.79–83), comprises the Ministry of the Gospel, which is the preaching and Baptism of repentance for the forgiveness of sins, the confession of Christ Jesus, the ongoing catechesis of His Word, and the faithful administration of His Body and His Blood to His disciples. This Divine Liturgy is not adiaphora (Leitourgia Divina adiaphora non est). This Divine Liturgy is the Holy Gospel, the Word and work of the Holy Triune God, which is fundamental and necessary to faith and life in Christ.
2. To be liturgical is not simply to "have" or "do" the Word and Sacrament; but to be liturgical is to be defined by these things of the Gospel, to be governed and guided by them, entirely under their sway. To be liturgical, therefore, is to be evangelical; and to be truly evangelical is to be liturgical.
3. The Divine Liturgy is where and how the Church lives with God in Christ, by grace through faith in the Gospel. The evangelical mission of the Church flows out of that liturgical life in Christ, with the purpose of bringing others into the Liturgy of the Gospel.
4. To hear and receive the Divine Liturgy in faith and with thanksgiving is the worship of the Holy Triune God in Spirit and in Truth. That godly Christian worship proceeds from the Altar and continues in daily prayer and catechesis throughout the week, within each Christian's proper vocations and stations in life; and it returns again to the Altar of Christ each Lord's Day.
6. Adiaphora simply are what they are: rites and ceremonies and other practices which are neither commanded nor forbidden by God. The teaching and confession of adiaphora goes hand-in-hand with the Gospel; that we are justified by grace through faith in Christ, apart from works of the Law.
8. Adiaphora are rightly used with pastoral care, and as a means of pastoral care. Pastors should exercise discretion and discernment in the use of adiaphora, but pastors should also discipline themselves in doing so, for the sake of faith and love.
10. All things are lawful, but not all things are meet, right and salutary (1 Corinthians 10:23). Even that which is free and clear can be measured and evaluated according to its service and support of the Word of God, and thus determined to be more or less helpful to faith and love.
13. The boundaries and parameters of freedom in worship are established and contoured, not only by explicit commands and prohibitions, but also implicitly by the constitutive rites and ceremonies of Holy Baptism, preaching and the Holy Communion.
14. The use of liturgical rubrics, rites and ceremonies is fundamental to the pastoral ministry.
Rubrics are instructions for the conduct of the Liturgy, mutually agreed upon within the fellowship of the Church. Rites are the words that are spoken in the administration of the Liturgy. Ceremonies are the bodily actions, movements and adornments of the Liturgy.
Rubrics are needed for an orderly conduct of corporate communal life. Rites belong to the fact that God does everything by His Word. Ceremonies belong to the fact that human life is lived in the body, occupying space and time.
15. It is not possible to administer and receive the means of grace without ceremonies. However, not all ceremonies are created equal. Some ceremonies are better, and some are worse than others; and some ceremonies have no place in the Church, even if they would otherwise be "free."
17. The measure of a ceremony’s worth and benefit requires more than the avoidance of overtly false doctrine. The best ceremonies are not only true (as opposed to false) but are positively helpful in confessing the Word of God, and they are beautiful in adorning His Liturgy. Whatever is true, lovely and of good repute, excellent and worthy of praise, dwell on those things (Philippians 4:8).
18. It is appropriate and salutary to adorn the Ministry of the Gospel with beauty, as a confession of faith in the Word and work of Christ, and as a way of catechesis in the hidden truth of the Gospel.
20. That which is harmful to faith and love is not free but forbidden. That which is irreverent or rude is likewise not free but forbidden. (Formula SD X.1, 7, 9)
28. The collective wisdom of the Church is usually wiser than the personal insights of an individual. Nevertheless, the nature and needs of pastoral care require the free exercise of pastoral discernment and discretion, just as the Church in each time and place is free with respect to human customs.
29. Frequent fluctuations and diversity in practice are unsettling to the people and easily distract from the Liturgy of Christ; they require a level of literacy, attention, energy and effort that tends to frustrate or make impossible the participation of many members in the Church’s worship of Christ.
30. Consistency and continuity of practice are beneficial to peace and rest in the Liturgy of Christ; they allow for and assist the ready participation of the entire congregation in the Church’s worship of the Holy Triune God.
31. The broad latitude of hymnody is necessarily constrained because of its affective power, and because of its vast importance and significance for the catechesis and confession of the Word. Hymns properly serve the freedom of faith in the Gospel when they are selected and used liturgically.
32. It is not an appropriate use of freedom when hymns (or songs), or any other practices, are used simply to fill up space and pass the time in worship, or when they are used to entertain emotions instead of edifying the people and glorifying God by the confession of His Word (Formula SD X.1, 7, 9).
33. The unity of a common confession of the faith is both embodied and substantiated by a unity of practice. Church fellowship does not depend upon a uniformity in adiaphora, but the fellowship of the Church gravitates toward a common and consistent usage of adiaphora wherever it is possible. And the beauty of it is, the Church is free to do so.
34. It is not a violation of faith or freedom when the fellowship of the Church mutually agrees, in love, to order and conduct its liturgical life according to common rubrics, rites and ceremonies.