In the midst of the Second World War Pope Pius XII put the whole world under the special protection of our Savior’s Mother by consecrating it to her Immaculate Heart, and in 1944 he decreed that in the future the whole Church should celebrate the feast of the Immaculate Heart of Mary.
The Feast of the Immaculate Heart of Mary is a devotional name used to refer to the interior life of the Blessed Virgin Mary, her joys and sorrows, her virtues and hidden perfections, and above all, her pure love for God the Father, her maternal love for her son Jesus, and her compassionate love for all people. Veneration of the Immaculate Heart of Mary generally coincides with the worship of the Most Sacred Heart of Jesus.
The devotion to the Sacred Heart of Jesus is especially directed to the “Divine Heart”, as overflowing with love for humanity. In the devotion to the Immaculate Heart of Mary, on the other hand, the attraction is the love of her Immaculate Heart for Jesus and for God. Feast is June 12.