[quote="Redratfish, post:7, topic:210630"]
What do you mean by the substance changes?
Are you refering to the bread itself? The bread is still physically bread, and the wine is physically wine, unless a miracle occurs (as it has happend) that makes turns them literally into blood and flesh.
can you clarify what you mean by substance?
Evidently, therefore, any philosophy may be reconciled with the dogma of transubstantiation which safeguards the distinction between the "the appearances" of a things and the thing itself; and this is a distinction which any system of philosophy must safeguard if it is not to run counter to right thinking. It is a commonplace of experience that realities are either "things in themselves" or else modifications or qualities of things that exist in themselves. A man, a tree, copper, zinc, these are substances; they exist in themselves. On the other hand, thought, extension, color, physical and chemical actions and reactions, are called in philosophical language accidents, because they require a subject, or a substance, in which to "inhere." Thought does not exisit except in a thinking subject; there is no extension, color, chemical activity, except in a corporeal substance. Substance and accidents, therefore, form a composite unity which is naturally indissoluble; yet, in reality as well as in thought, they are distinct from each other as that which exists in itself must be distinct from that which, in order to exist, requires a subject of inherence. Thus a bodily substance is not its size, its shape, its color, its chemical or physical properties, nor is it the sum of these; it is that which possess these properties, is located, acts and reacts by means of them, and through them manifests itself to the senses. The substance as such is impervious to the senses; if a body had no extension we could not touch it, if it had no color we could not see it. Hence we commonly give to the accidents of material substances the name of appearances, since it is through these accidents, perceived by the senses, that the mind arrives at the knowledge of the substance.
Hope this helps.:tiphat: