“Our Lady of Fatima summed up the motive of all Her apparitions and requests with these poignant words: ‘So numerous are the souls which the justice of God condemns for sins committed against Me, that I come to ask for reparation’. This is the very heart of the First Saturday devotions – Our Lady’s urgent and heart-rending plea that we make reparation on behalf of sinners who will otherwise be lost.
“Nowhere is this plea more movingly expressed than in Our Lady’s formal request for the promulgation of the Five First Saturdays." (Fr. Gruner, First Saturday Meditation Manual, available here)