One of the favorite prayers of Blessed Jacinta of Fatima was "Sweet Heart of Mary, be my salvation."
To many, this may sound a bit extreme, in fact, it may look like Jesus is being completely overlooked.
The Immaculate Heart of Mary is the most perfect response to the Word of God that any mortal may make. Her response, "Fiat" at the Annunciation, which continued to the Cross and beyond, to the very day of Pentecost (events linked so beautifully in Pope John Paul II's encyclical, Redemptoris Mater) is the same response of the Heart that "contemplated" all that took place during Jesus' infancy, hidden life at Nazareth, public ministry, Passion and Death.
The First Saturdays were requested by our Lady to Sister Lucia in order to make reparation for the insults and indignities to Her Immaculate Heart. If someone despises the Mother, they cannot love the Son. The Two Hearts are in complete communion.
And so, to honor the "Sweet Heart of Mary" we are honoring the Son. She is the Immaculate vessel that made His Incarnation, Life, Passion, Death and Resurrection possible.
She truly shares in His mission to save the world.