The Divine Mercy Devotion (linked)
I believe it. But I'm interested in knowing who else believes it here in the OBOB sub-forum? I know that it's not technically required that Catholics believe it since it's a private revelation. But, on the other hand, it's not only approved by the Church, it's also on the Church calendar and strongly encouraged by the Church for private devotion. Just recently, Pope Francis even came out with a Papal Bull which officially designates an upcoming year-long period as a "Jubilee of Mercy." And, lest there be any doubts about the connection to the Divine Mercy devotion, the Papal Bull was announced on the Sunday of Divine Mercy, and Pope Francis specifically mentions St. Faustina in it.
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