This is how I understand the question you have asked.
I am working through some thoughts on the Lord's Supper. I keep stumbling over this phrase in 1 Corinthians 11:27
"Therefore whoever eats the bread or drinks the cup of the Lord in an unworthy manner, shall be guilty of the body and the blood of the Lord."
The nagging question for me is in what SENSE is an unworthy partaker guilty of the body and blood of the Lord?
What I'm really wanting to find out is how wide the spread of thought is on this topic among the reformed community. Something like a survey. Feel free to convince me with details, but my prime concern is getting a feel for the variety of opinions represented here. ESPECIALLY if you feel your understanding on this is "variant/minority" or it hasn't been expressed yet in the thread, I want your input.
I am a Presbyterian and only a Protestant for a few years and this is how I understand the question you have asked. Corinthians 11:28 says “But let a man examine himself and so let him eat of the bread and drink of that cup”
If a man takes communion and knows he is an unworthy recipient of the elements at the Lords Supper than I believe he is guilty of sin. That person would also be a person who has been abandoned by God because by his own fault and freewill he has deserted the grace of God by not just doing evil but rejecting Gods grace for salvation. Such a person is already dammed to hell by the doctrine of Predestination and commit’s a further sin when taking the elements at communion when he is out of the grace of God by his own freewill and could go to hell for that very practice.
I have been doing some recent study on the doctrine of predestination and this is what I believe may also help you in understanding the question you ask. Predestination is taught clearly in the Bible: "For he chose us in him before the creation of the world to be holy and blameless in his sight. In love he predestined us to be adopted as his sons through Jesus Christ, in accordance with his pleasure and will …" – Ephesians 1:4-5; "In him we were also chosen, having been predestined according to the plan of him who works out everything in conformity with the purpose of his will …" – Ephesians 1:11; "For those God foreknew he also predestined to be conformed to the likeness of his Son, that he might be the firstborn among many brothers. And those he predestined, he also called; those he called, he also justified; those he justified, he also glorified." – Romans 8:29-30
Even St. Thomas Aquinas and thus even when I was a Roman catholic I knew the Roman Catholic Church while not emphasizing the matter teaches predestination: "The causality of reprobation is unlike that of predestination. For predestination is the cause both of what is awaited in the future, namely glory, and of what is received in the present, namely grace. Whereas reprobation is not the cause of present fault, but of future result, namely, of being abandoned by God. Fault is born of the freewill of the person who deserts grace." (Summa Theologica, I, 23, 4)