I don’t know how much you understand about Aristotle, Thomas Aquinas, and Catholic theology, but you must understand that the Catholic Church has formally Defined its teaching on the Real Physical Presence of Christ in the Eucharist. One accepts it on Faith because Christ taught. The terms the Church used to Define this Dogma are those of Thomas Aquinas, which are similar to but not restricted to those used by Aristotle. So, in a sense, the Church has " canonized " Thomas’ use of these terms in this Dogma.
Thomas spoke of first and second substance, as did Aristotle. First substance being the " thing " as you see it, second substance being the underlying subject in which first substance is lodged. Both are absolutely real. The difference is that the second substance cannot be " seen " or measured in any way. This is what you have called the " philosophical substance. " First substance is essentially all the accidents, including all the atoms, protons, electrons, hair, eyes, ears, size, weight, etc. which you can see and/or measure and which flow from and exist in second substance, the underlying reality.
The First Substance according to Aristotle is a specific individual physical entity. For example, a particular book, a specific rock, a specific piece of bread, a specific person. We understand this in modern times as a collection of specific atoms arranged in a specific way; that’s what makes up the First Substance. The Second Substance is an abstract association of a First Substance to a given group. Many First Substances can be in the Second Substance. For example, Aristotle is a First Substance. His Second Substance includes classifications from man to mammal to vertebrate to animal to organism. Second Substance is a grouping, a mental construct. An Accident is a property of a First Substance, for example Brown, 30 Grams, On The Table, 100 calories, etc. Physical accidents arise from the presence and arrangement of atoms in physical space.
So how is the Second Substance anything other than an abstract categorization? Can you give some other examples of Second Substance, outside of the Eucharist?
But in the act of transubstantion, the underlying second substance of the bread and wine are changed into the body and blood of Christ, the whole man, second and first substance, with all his accidents - limbs, hair, atoms, protons, etc. But by a miracle of God the accidents of the bread and wine remain, but in no substance, they just are and are in the real physical sense - but they no longer exist in a substance or subject. They act as a veil, covering the Real Presence. Yet they retain all their normal physical characteristics. This is the second miracle of the Eucharist, the first being that of Transubstantiation.
So the First Substance does not change, since the bread continues to be the same discrete arrangement of atoms. These particular atoms are not swapped out with other particular atoms of the exact same type and arranged in the exact same way. The accidents don’t change, since they still arise from the same arrangement of atoms. But the Second Substance does change? Since the Second Substance is just an abstract grouping, why is this a miracle?
And what exactly do you mean by a veil? I know what a physical veil is; a piece of cloth or other object which gets between the observer and the observed such that the veil object is seen (by light particles reflecting off the veil) instead of the observed. Does this veil affect the atoms and how they react with light and other atoms in some way?
A miracle, by definitiion, is an act that cannot be explained by man. Nor can it be proven true in any way, except on the word of God Himself. And the Church has never presented the case otherwise. You either believe it or you don’t. My point here is just to explain why
, in the eyes of science, nothing seems to have changed. That has never been a problem for Catholics who know their Faith as well as they should. It is only a problem for non-believers who do not grant the existence of miracles, or who may not believe, even, that God exists. Unfortunately, we can’t do anything about this lack of understanding except to present the teaching and trust to God to open eyes that remain closed.
So if a miracle cannot be explained, or reproduced, or be reliably detected, and doesn’t change anything in they physical world, and is only believed based on the word of someone else… how does one reliably distinguish between a miracle and a falsehood?
And just so we’re clear, everyone here does recognize that the physical world is made up of atoms arranged in particular ways, and that an object’s color, weight, appearance, taste, ability to be digested, etc. is all derived from how those atoms are physically interacted with and re-arranged by light or other atoms, right? That much is not in dispute. This is not a view of reality or an interpretation of it or a philosophy of reality; it is a description of what is actually happening. This doesn’t rule out additional things happening, but it does require that any philosophical view of the world is compatible and reconcilable with the physical existence we are in.