This whole time I had thought that the Sacred Heart was Mary's heart, it's only today that I've learned that the Sacred Heart is Jesus's and it's Mary's heart that's the Immaculate one. In my defence I'm not a Catholic, never have been, and have no real reason to know about any of this stuff. Anyway, whether it's sacred or immaculate, you can't deny that Mary's sorrowful heart is one of the fucking hardest pieces of iconography ever:
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Say what you like about goths, they were really on to something when they came up with Catholicism.