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I don't know what to tell you. It's plain as day. No contorting is needed. No secret handshakes or hidden meanings.

During Mass, the faithful are briefly participating in the eternal liturgy of Heaven (duh, eternal, right?). Christ is present with us. You don't have to believe it. Just understand that Mass is our temporary connection to Heaven. Mass is a central part of the Catholic experience, with some parishes even having Mass twice a day. It's not just a Sunday thing. If you can't make it to Sunday service, you can attend Saturday service, or Monday. Each time, it is largely following Revelations and, of course, the example of The Last Supper.