Hi, Raymond —
Thanks for your question.
The Doctrine of Transubstantiation
says that the substance changes
and the accidents remain the same.
Philosophically, the chemical structure of bread is
not the substance, it is the accident.
It is what gives
bread it's appearance right down
to it's microscopic level. Were you
to put a Consecrated Host under the
microscope, you wouldn't see Jesus'
protoplasm and chromosomes; you would
see bread.
The Church teaches the Real Presence
is a sacramental presence not physical
presence. There is a change in substance (being or essence), not a
change in chemistry. Transubstantiation
is therefore a philosophical definition,
not a scientific one.
We believe that the Body, Blood,
Soul, and Divinity are present under
the appearance of Bread and Wine.
The substance of the bread and Wine,
is not longer there, but all the
accidents right down to the chemical
composition remain. In fact, the
substance of Christ only remains
so long as the accidents remain.
When a consecrated Host breaks down
in your digestive tract, the substance of Christ no longer remains in the
elements, although the person has
Communion with Christ.
John
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