Please explain how this would advance our discussion. I am not making any claim regarding substance and baptism and so your request seems misplaced. I don’t hold to a Thomistic philosophy so I would have to first pretend that I thought something called substances were involved and then make up an answer from there. Further, I kept it simple and merely asked about the elimination of the substance of the bread rather than the addition of the substance of the body. Regarding the Christian and baptism, you haven’t clarified if you wanted the explanation to focus on the substance of the mind, body, spirit or soul of the person or some combination of them.
I included Baptism to try to illustrate that the principles of transubstantiation as understood by the Catholic Church are actually accepted by almost every Christian in the world, in the guise of sanctifying grace.
The difference between a person before and after Baptism is that before Baptism, he/she was not a Christian; after, he/she is a Christian. And you know how much that changes a person spiritually: there are many effects, but one of the main effects is (if the Bible is correct, or at least if the interpretation of most Christians is correct) before Baptism, if that person dies, there is no assurance he/she goes to Heaven; but if he/she dies right after Baptism, he/she goes straight to Heaven.
And yet scientists (even in the far future I’d wager) will be hard pressed to find ANY change in composition of a person before and after Baptism. For there is NO physical change brought about by Baptism, only spiritual. But this is no symbolic change: before, the person has no assurance of salvation; after, there is.
In other words, the substance…the ESSENCE…of the person changed (which is why there is such a thing as a Christian), and yet there was no change in any physical accident of the person from being a non-Chrisian to being a Christian.
I do not think any Christian will dispute this…even you Radical.
Let us go back to the transubstantiation of the bread and wine. There is no need to list the physical accidents before and after the bread and wine is consecrated, for before and after,
there will be no change sensibly. The physical and chemical composition (at least what we and any scientific test can determine) will stay the same. The Bread will still cause severe reactions to those with celiac disease. The Wine will still cause drunkenness when too much is taken. Radiotag them, and their remains will be seen in the feces. There is
no sensible change in the accidents. But (if the interpretation of the Bible by the Catholic Church is correct) this Bread and this Wine (note I, and the Church, still call them Bread and Wine, because of their sensible accidents) gives everlasting life (John 6), kills those that take it unworthily, (1 Cor 11:27-30), washes away our sins (1 John 1:7), and unites the Church into Christ’s body (1 Cor 10:17). And because no ordinary bread and wine can do this, the Church has
no choice but to say that there is a change in substance…in ESSENCE… of the Bread and Wine, in spite of no sensible change in its accidents.
It is a mystery: a mystery as mysterious in almost every way as Baptism.