The Catholic Church commemorates the Feast of the Sacred Heart of Jesus on the first Friday after the Solemnity of the Body and Blood of Christ, falling on June 12th in 2026. The feast centers on devotion to the physical and spiritual heart of Jesus Christ as a symbol of divine love. While the devotion existed previously, Poland played a crucial role in its formal establishment and widespread propagation. The origins of the public veneration are linked to the visions reported by Saint Margaret Mary Alacoque, a French nun, in the 17th century. However, it was Polish priests and communities who actively championed the devotion, facing initial skepticism from some Church authorities. Their persistent efforts ultimately led to the official recognition and celebration of the Feast of the Sacred Heart of Jesus throughout the Catholic Church. Today, the feast is observed by Catholics worldwide.