Protestants sometimes charge Catholics with “vain repetition” in praying the Rosary. This is a reference to Matthew 6:7, where Jesus instructs, “When you pray to not babble with vain repetition as the pagans do.” …
The second apparition (June 13, 1917) Our Lady of Fatima reiterated the importance of the rosary and added a devotion to her Immaculate Heart in reparation of the offenses to her Immaculate Heart. In the July apparition, again was reiterated the importance of the 5 decade rosary prayed daily and offered to Our Lady of the Rosary to obtain Peace in the world.
Inspired to offer up all his sufferings to Jesus for the salvation of sinners, Francesco said this prayer, “My God, we offer you all these sufferings and sacrifices! It is an act of reparation for the conversion of Sinners.” At the first apparition, Our Lady of Fatima told the children to Say the rosary every day, to obtain peace for the world, and the end of the war. (5 decade rosary each day)