My position comes from being a student of Thomas knowing that he is a master of using term equivocally that we only use univocally today. Also, Halligan states that it must be of unleavened bread not stopping to qualify that it is only an issue of being licit and not validity but rather he uses the strong word - must. Must implies necessity.
Mosher, I have to admit that Fr. Halligan gives me pause, not only on the issue of the Eucharist but on the Absolution. But Fr. Halligan aside, I think you might be reading to much into St. Thomas’s article here. Thomas’ statement “It is not, however, necessary for the sacrament that the bread be unleavened or leavened, since it can be celebrated in either.” seems pretty clear to me that both leavened and unleavened bread is valid matter. I know you know this as well (see also The Council of Florence: “We have likewise defined that the body of Christ is truly effected in unleavened or leavened or wheaten bread; and that priests ought to effect the body of our Lord in either one of these, and each one namely according to the custom of his Church, whether that of the West or of the East”) Florence’s “truly effected” seems to me only one thing, that both are valid matter. But either can be illicit according to one’s rite.
I think Fr. Halligan’s use of the word must in this case refers only to a juridical necessity, and goes to liciety not vlaidity.
mosher:
Thomas answers this question. The bare minimum is “I absolve you,” which Trent echos. which all of Sacramental Theology echos.
Hmmm. I wonder. How about the deprecative form, “May God absolve you”?
mosher:
However, your idea that “any valid absolution (meaning any form that was valid in the 2nd century, or in the Eastern Churches, etc) would still be valid today” is not correct.
Ah, yes, I admit that I resorted to an inartful use of hypoerbole there. I shouldn’t have said “valid absolution”. I shouldn’t have linked it to absolution at all. What I meant to convey was that, generally, valid matter, once admited as valid, usually remains valid, or has the possibility of being valid. The same seems true, generally, for old forms. I can’t think of a case where the Church has said that at one time this matter was valid and now it is not.
mosher:
Perhaps the Eucharist was a bad example
I agree.
mosher:
Perhaps matrimony is a better example of this as there is the imposed canonical form for validity . . Or that if a significant separation from legitimate authority is present then Matrimony and confessions can be invalid while all the other sacraments would still be valid.
Ah ha! That is exactly what I was trying to get at. Thank you for expressing it this way. Perhaps the best example would be absolution that is invalid not due to invalid form or invalid matter but due to the reservation of certain sins to the Bishop, or the priest lacking sufficient faculties (i.e. out of his jurisdiction).
mosher:
What I am trying to express here is that it is a little more messy then you think.

But I did think it was messy. And I have been engaging in this conversation in order to understand what you have been trying to express.
mosher:
This is where he is completely wrong. Just as if a priest intended to confect the Eucharist but used the wrong words even if they nearly meant the same thing the sacrament would not be confected.
Jimmy completely wrong?! ; ) I think you might be misunderstanding Jimmy’s point. He is not advocating that the minister’s intention overrides the necessary form. . . but this is really a side issue. I just didn’t want Jimmy to be charged with being completely wrong without someone rising to his defense.
mosher:
I am wondering if you have read all that I have wrote?
Hmmmm. Perhaps not as carefully as I should have? I apologize for that.
I think I was focusing too much on you satement “In the west a priest must for validity [use] just unleavened wheat bread”, which I still don’t understand, and I think you might be in error here. A priest in the Latin rite can consecrate leavened bread. If it can be consecrated than it is valid matter, no?
Anyway Mosher, thank you for the discussion. Your insight regarding impaired faculties, or as you put it “significant seperation from legitimate authority”, hit the nail right on the head for me, and helped me to think more clearly regarding the form of absolution (and other sacraments).
Thanks again for the discussion,

it was excellent,
God Bless you,
VC