“Rightly, then, the liturgy is considered as an exercise of the priestly office of Jesus Christ. In the liturgy the sanctification of the man is signified by signs perceptible to the senses, and is effected in a way which corresponds with each of these signs; in the liturgy the whole public worship is performed by the Mystical Body of Jesus Christ, that is, by the Head and His members.”
-Sacrosanctum Concilium, 7
“Therefore no other person, even if he be a priest, may add, remove, or change anything in the liturgy on his own authority.”
Sacrosanctum Concilium 22.3
“And at the proper times all should observe a reverent silence.”
Sacrosanctum Concilium 30
The Church acknowledges Gregorian chant as specially suited to the Roman liturgy: therefore, other things being equal, it should be given pride of place in liturgical services.
Sacrosanctum Concilium, 116
Ordinaries, by the encouragement and favor they show to art which is truly sacred, should strive after noble beauty rather than mere sumptuous display. This principle is to apply also in the matter of sacred vestments and ornaments.
Let bishops carefully remove from the house of God and from other sacred places those works of artists which are repugnant to faith, morals, and Christian piety, and which offend true religious sense either by depraved forms or by lack of artistic worth, mediocrity and pretence.
Sacrosanctum Concilium 124
In the Latin Church the pipe organ is to be held in high esteem, for it is the traditional musical instrument which adds a wonderful splendor to the Church’s ceremonies and powerfully lifts up man’s mind to God and to higher things.
Sacrosanctum Concilium 120
36. 1. Particular law remaining in force, the use of the Latin language is to be preserved in the Latin rites.