The orthodox view of the Eucharist (excised from the Novus Ordo Holy Thursday readings but maintained in the Extraordinary Form) is: "whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord." -1 Corinthians 11:27

The Eucharist is food and medicine to a soul in venial sin, but to a soul in which sanctifying grace is dead, sin is compounded with the additional sin of sacrelige.