How do Roman Catholics reconcile Acts 15:20 with transubstantiation?

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Transubstantiation for a Catholic is from the philosophic concept of substance and accidents which could perhaps be phrased reality and appearance. The substance is the reality of the thing, in this case bread or wine and the accidents is what it appears to be. During the consecration, each element (bread and wine) are changed in substance while the accidents remain the same so, for example, the wine is changed into the blood of our Lord really and truly in the sacrament while still looking, smelling and tasting like wine.

The question equates the changed wine with the substance & accidents of blood which is not the case here. The blood referred to here is both blood in accidents and substance. While the Greek αἷμα can refer to literal blood or those things that refer to blood such as the blood of grapes (eSword G129, Thayers & Strong's), one must take this commentary reference into account:

20. (in part)... The four classes (also v28; 21:25) seem to be four of the things proscribed by Lev 17-18 for aliens residing in Israel: meat offered to idols, the eating of blood and of strangled animals (not ritually slaughtered) and intercourse with close kin (see Lev 17:8-9, 10-12, 15 [Exod 22:31]; 18:6-18). 21. Supporting the four clauses (gar) is their recognition factor, based on the universal Torah instruction. The New Jerome Biblical Commentary, pg 752

This reference to Leviticus is not a sacramental but a literal reference, hence requiring the blood (αἷμα) referred to in the passage to be meant literally as blood and not in some other way, hence there is no contradiction as it might appear on the surface.

This is a good article from the old Catholic Encyclopedia that discusses transubstantiation http://www.newadvent.org/cathen/05573a.htm#section3.

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Read just about any commentary and it will tell you that the restrictions in Acts 15 are 1) temporary (for the church at that time), and 2) based on the prohibitions in Leviticus 17 and 18. They are meant for allowing the Jews and Gentiles of the first-century church to integrate so that they could be united. Protestants and Catholics are usually agreed on these points.

The prohibition in Leviticus 17 is dietary and refers to the blood of animals. Ordinarily one eats only plants and animals as part of their diet. But sacramentally we partake of Christ's body and blood. This is no more a violation of the prohibition against blood of animals than it is a violation of the prohibition against cannibalism. Jesus commanded us to partake of his body and blood. It scandalized the people, but he insisted.

So with all that being said, I don't think it makes sense to point to the fact that Acts 15 is about blood that has the accidents of blood when the blood in the Eucharist has the accidents of wine. Blood is blood. The whole point of the doctrine of transubstantiation is that, despite the look, taste, etc. it is blood. Therefore I think the actual distinction, from a Catholic perspective, is between animal blood (with a basis in the Jewish law) and Christ's blood (which he commanded us to partake).

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The eucharistic blood does not run afoul of Acts 15:20 for the same reason that the eucharistic body is not cannibalism, even though it is the eating of the body of Christ. There are two answers to this question here, but I don't like either one.

Transubstantiation is a metaphysical reality, not a physical reality. If you know about metaphysics, then the substance changes, but the accidents don't. If you're not into metaphysics, then it's not the appearance of the bread and wine that changes, but the significance of the elements.

We're not eating a human body that we've just killed and boiled in a pot. We're eating the second person of the living deity that has just entered into bread and wine, ordinary-looking food, so that He might enter us and commune with us. In the same way, the second person of that very same deity once entered into a physical human body and lived a life on earth and died a horrible death, but then rose from the dead and ascended back into heaven. His sacrifice, once and for all, saves us and we participate in that sacrifice by taking communion.

By analogy, in the Old Testament the Jews had a communion sacrifice in which a lamb was killed, part was burned on the altar, and the rest was consumed by the family. The significance here was that God was sharing a meal with the family. The mutton was no longer ordinary meat, but had been made holy by the sacrifice. God was present because He resided in the temple, and because He was invited to the family's meal by the sacrifice.

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