Mary, Mother of the Church: Why the New Feast Day?

We're in Rome today for the very first celebration of "Mary Mother of the Church" - the new feast instituted by Pope Francis this year. But why do Catholics call Mary "Mother of the Church"?  Is there any Biblical basis for this?  And what does this mean for us today?

Recorded live in St. Peter's Square with Edward Sri's annual Rome pilgrimage group.

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