The confession may be made on the First Saturday itself or some days before or after the First Saturday. This reparatory devotion was requested to atone for the five ways in which people offend the Immaculate Heart of Mary:

1. attacks upon Mary's Immaculate Conception;
2. attacks against her Perpetual Virginity;
3. attacks upon her Divine Maternity and the refusal to accept Her as the Mother of all mankind;
4. for those who try to publicly implant in children's hearts indifference, contempt and even hatred of this Immaculate Mother, and 
5. for those who insult her directly in her sacred images.     

     On November 1, 1927, Sister Lucy wrote to her godmother, Dona Maria de Miranda:

"I don't know if you already know about the reparatory devotion of the five Saturdays to the Immaculate Heart of Mary. As it is still recent, I would like to inspire you to practice it, because it is requested by Our dear Heavenly Mother and Jesus has manifested a desire that it be practiced. Also, it seems to me that you would be fortunate, dear godmother, not only to know it and to give Jesus the consolation of practicing it, but also to make it known and embraced by many other persons.
     "It consists in this: During five months on the first Saturday, to receive Jesus in Communion, recite a Rosary, keep Our Lady company for fifteen minutes while meditating on the mysteries of the Rosary, and make a confession. The confession can be made a few days earlier, and if in this previous confession you have forgotten the (required) intention the following intention can be offered, provided that on the first Saturday one receives Holy Communion in a state of grace, with the intention of repairing for offenses against the Most Holy Virgin and which afflict Her Immaculate Heart.
     "It seems to me, my dear godmother, that we are fortunate to be able to give Our dear Heavenly Mother this proof of love, for we know that She desires it to be offered to Her. As for myself, I avow that I am never so happy as when first Saturday arrives. Isn't it true that our greatest happiness is to belong entirely to Jesus and Mary and to love Them and Them alone, without reserve? We see this so clearly in the lives of the saints...They were happy because they loved, and we, my dear godmother, we must seek to love as they did, not only to enjoy Jesus, which is the least important—because if we do not enjoy Him here below, we will enjoy Him up above—but to give Jesus and Mary the consolation for being loved...and that in exchange for this love they might be able to save many souls."

Sister Lucy wrote in her Memoirs:

In March, 1939, Our Lord said to me once more, 'Ask, ask again insistently for the promulgation of the Communion of Reparation in honor of the Immaculate Heart of Mary on the First Saturdays. The time is coming when the rigor of My justice will punish the crimes of diverse nations. Some of them will be annihilated. At last the severity of My justice will fall severely on those who want to destroy My reign in souls."