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Faith1960
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Thanks. There was a post long ago by someone (Ambrose?) who linked to a page by sAt. Thomas Aquinas or someone that explained how this was a philosophical term. I can’t find it. Does anyone have it handy or know where I can look?The substance of a thing is its … “thing-ness.” Not any descriptive thing about it, like size or shape or color or sound or taste or texture (those are all accidents) but the underlying reality of the thing. Normally, you can’t have a thing without having the accidents of that thing, and if you change the substance of a thing (from wood to ashes by fire, for example) the accidents also change (ashes do not look or otherwise respond to the senses like wood).
In transubstantiation, the claim is that the substance of the bread and wine – but not any of their accidents – is changed into the substance of Jesus’ body and blood. So the identity of what’s there is changed, from “bread-ness” and “wine-ness” to “Jesus-ness,” but every property that we can sense or measure remains that of bread or wine.
It’s a strange idea, to be sure, and it’s pretty much the only time we have to worry about a change of substance occurring undetectably. Some people mix up “substance” with scientific concepts like “molecular structure” and wonder why we can’t tell that the change has occurred with microscopes and other scientific instruments – but molecular structure still operates on the accidental level. When we say the substance changes, we mean that what this thing IS changes, not anything we can sense or measure.
Now, more recent systems of philosophy tend to deny that a thing has an underlying “thing-ness” that is separate from its actual properties. To some degree, Catholic theology is kind of shackled to older currents of philosophy because we use those terms to define what happens in the Eucharist. But no attempt to reproduce the same idea without using substance/accident terminology has been entirely successful.
Usagi