[quote=CheesusPowerKid]Sorry if this seems like a stupid question, but I was just wondering if anyone could explain to me exactly what the Sacred Heart is…
This is NOT a stupid question (and I would tell you if it was - I don’t sugercoat stuff).
This is a devotion to the heart of Jesus. It has a somewhat turbulent history.
St. Mechtide (d.1298) and St. Gertrude (d. circa 1303) were visionaries who described the image of the Sacred Heart in rich detail. But their visions attracted little interest and little following until the Carthusians and (mainly) the Jesuits took particular interest. The Jesuits and St. Francis de Sales worked together to obtain popular recognition, but their efforts were not very effective until a Visitandine nun, St. Margaret Mary Alacoque, recounted visions which gave form to the image (especially in reparation for outrages against the Divine Love, especially as manifest in the Blessed Sacrament).
The Sacred Heart then became one of the most popular devotions of the Catholic Church. Liturgical observance was first permitted by Clement XIII in 1765, and was extended to the Universal Church by Pius IX in 1856.