[quote="ConstantineTG, post:1, topic:304280"]
First let me make this clear that I am not intending this thread to become new form vs. old form, nor should there be any insinuation that the new form is anyhow invalid. I believe that whatever is in the Church is valid regardless of form (if you look across Rites including the East, there are many forms. So validity should not be limited to one form alone).
Anyway, my question is, have there been any change to Sacramental theology in the Latin Church pre- and post- Vatican II? For example, was it always taught that anyone can perform baptisms in cases of necessity and not just, say, baptized persons?
How about the other Sacraments, did anything change in terms of theology? (again, this is not to say that the change leads to invalidity. I believe that the Church has the authority to say what makes a Sacrament valid or not).
Regarding Baptism, I don't think anything changed. Look at this section from the Catechism of Trent (Roman Catechism).
The Ministers of Baptism
Ministers of Baptism - From Trent Catechism
In the next place, it appears not only expedient, but necessary to say who are ministers of this Sacrament; both in order that those to whom this office is specially confided may study to perform its functions religiously and holily; and that no one, outstepping, as it were, his proper limits, may unseasonably take possession of, or arrogantly assume, what belongs to another; for, as the Apostle teaches, order is to be observed in all things.
Bishops And Priests The Ordinary Ministers
The faithful, therefore, are to be informed that of those (who administer Baptism) there are three gradations. Bishops and priests hold the first place. To them belongs the administration of this Sacrament, not by any extraordinary concession of power, but by right of office; for to them, in the persons of the Apostles, was addressed the command of our Lord: Go, baptise. Bishops, it is true, in order not to neglect the more weighty charge of instructing the faithful, have generally left its administration to priests. But the authority of the Fathers and the usage of the Church prove that priests exercise this function by their own right, so much so that they may baptise even in the presence of the Bishop. Ordained to consecrate the Holy Eucharist, the Sacrament of peace and unity, it was fitting that they be invested with power to administer all those things which are required to enable others to participate in that peace and unity. If, therefore, the Fathers have at any time said that without the leave of the Bishop the priest has not the right to baptise, they are to be understood to speak of that Baptism only which was administered on certain days of the year with solemn ceremonies.
Deacons Extraordinary Ministers Of Baptism
Next among the ministers are deacons, for whom, as numerous decrees of the holy Fathers attest it is not lawful without the permission of the Bishop or priest to administer this Sacrament.
Ministers In Case Of Necessity**
Those who may administer Baptism in case of necessity, but without its solemn ceremonies, hold the last place; and in this class are included all, even the laity, men and women, to whatever sect they may belong. This office extends in case of necessity, even to Jews, infidels and heretics, provided, however, they intend to do what the Catholic Church does in that act of her ministry. These things were established by many decrees of the ancient Fathers and Councils; and the holy Council of Trent denounces anathema against those who dare to say, that Baptism, even when administered by heretics, in the name of the Father, and of the Son, and of the Holy Ghost, with the intention of doing what the Church does, is not true Baptism.
And here indeed let us admire the supreme goodness and wisdom of our Lord. Seeing the necessity of this Sacrament for all, He not only instituted water, than which nothing can be more common, as its matter, but also placed its administration within the power of all. In its administration, however, as we have already observed, all are not allowed to use the solemn ceremonies; not that rites and ceremonies are of higher dignity, but because they are less necessary than the Sacrament.
Let not the faithful, however, imagine that this office is given promiscuously to all, so as to do away with the propriety of observing a certain precedence among those who are its ministers. When a man is present a woman should not baptise; an ecclesiastic takes precedence over a layman, and a priest over a simple ecclesiastic. Midwives, however, when accustomed to its administration, are not to be found fault with if sometimes, when a man is present who is unacquainted with the manner of its administration, they perform what may otherwise appear to belong more properly to men.
Although I don't know if deacons are considered "extraordinary" ministers these days.