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Read the Bible or read the Westminster. You'll profit from both of them. The Westminster only repeats the Scriptural truth.
"The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?
For we being many are one bread, and one body: for we are all partakers of that one bread." -- 1 Co 10:16-17

Are you and I also physically in the bread? That's what the words say. Or are we spiritually of the one bread, and that is what the words mean?

"For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit." -- 1 Co 12:13

And so "we drink into one Spirit." We do not literally drink the blood of Christ. That is left-over paganism.

"And they truly were many priests, because they were not suffered to continue by reason of death:
But this man, because he continueth ever, hath an unchangeable priesthood.
Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself." -- Hebrews 7:23-24,27

Christ offered one sacrifice to God for the sins of His sheep and it was accepted as paid in full. The writer of Hebrews describes those who vainly offer continual sacrifices to God for a debt that has already been paid.

"And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins:
But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God.
For by one offering he hath perfected for ever them that are sanctified.
Now where remission of these is, there is no more offering for sin." -- Hebrews 10:11-12,14,18

Again, "where remission of these is, there is no more offering for sin."

And this offering is what we are to remember.

The mass is a perpetual sacrifice to God, offered by a man who blasphemously presumes himself to be "another Christ."

I'm going to sleep now and think of happier thoughts than these idolatries.