No one disagrees with the fact that all grace comes from and through Christ. The scapular is simply an aid, like a timer, perhaps. Christ sees that we are physical beings and that physical aids help us. One does not *have* to wear a scapular.
I do not understand what you mean about performing to receive grace. God never **owes** us grace, but, for example, focusing our minds on Christ by praying will increase our ability to *receive* grace.
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Note: My discussions here are multiplying, and my ability to explain (knowledge, time, etc.) is being strained, so this may be my last post on this subject. Please don’t take my limited abilities as evidence that the Church lacks explanatory force, simply that *I* am limited.
Oh?
Again; I've missed "that" in the book Rome assembled.