What does "all matter of the heart" mean? Is it an idiom?
"Matters of the heart" is not an idiom, but a phrase that is used and interpreted in different ways. In general, "matters of the heart" refers to one's emotions or feelings, particularly those regarding love. Therefore, "all matters of the heart" here means "all emotions regarding love". "Matters of the heart" is not a common phrase and is not used in conversational English. It is usually used poetically.
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