SC22A) General norms1. Regulation of the sacred liturgy depends solely on the authority of the Church, that is, on the Apostolic See and, as laws may determine, on the bishop.2. In virtue of power conceded by the law, the regulation of the liturgy within certain defined limits belongs also to various kinds of competent territorial bodies of bishops legitimately established.3. Therefore no other person, even if he be a priest, may add, remove, or change anything in the liturgy on his own authority.
So then, brethren, stand firm and hold to the traditions which you were taught by us, either by word of mouth or by letter (2 Thess. 2:15). Guard what has been entrusted to you. Avoid the godless chatter and contradictions of what is falsely called knowledge, for by professing it some have missed the mark as regards faith (1 Tim. 6:21-22).