The popularization of the devotion to the Sacred Heart in its modern form is derived from a Roman Catholic nun from France, Saint Margaret Mary Alacoque, who said she learned the devotion from Jesus during a series of apparitions to her between 1673 and 1675, and later, in the 19th century, from the mystical revelations of another Catholic nun in Portugal, Blessed Mary of the Divine Heart, a religious of the Good Shepherd.
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