The Sacred Heart symbolizes the profound love and compassion of Jesus Christ and gained popularity in the Middle Ages, especially through the visions of Saint Margaret Mary Alacoque in the 17th century. Alongside it are the Chaste Heart of Saint Joseph, representing purity and care for Jesus and Mary, and the Immaculate Heart of Mary, pierced by a sword to signify her sorrow and unwavering love. Together, these hearts embody the love, sacrifice, and purity central to Christian belief, offering insight into the spiritual and historical foundations of Christianity.