But in all these matters we will want to beware lest we make binding what should be free, or make sinners of those who may do some things differently or omit others. All that matters is that the Words of Institution should be kept intact and that everything should be done by faith. For these rites are supposed to be for Christians…who observe them voluntarily and from the heart, but are free to change them how and when ever they may wish. Therefore, it is not in these matters that anyone should either seek or establish as law some indispensable form by which he might ensnare or harass consciences. Nor do we find any evidence for such an established rite, either in the early fathers or in the primitive church, but only in the Roman church. But even if they had decreed anything in this matter as a law, we would not have to observe it, because these things neither can nor should be bound by laws.
Martin Luther
An Order of Mass and Communion for the Church at Wittenberg