#19. "With zeal and patience pastors of souls must promote the liturgical instruction of the faithful and also their active participation, both internal and external, taking into account their age, condition, way of life and standard of religious culture. By so doing pastors will be fulfilling one of the chief duties of a faithful dispenser of the mysteries of God, and in this matter they must lead their flock not only by word but also by example..."
A. General Norms
...(3) "Therefore no other person, not even a priest, may add, remove, or change anything in the liturgy on his own authority..."
Vatican Council II, 1981 Edition