With this prayer Jesus promises the forgiveness of sins and the request for a grace

Most beloved Lord Jesus Christ, most gentle Lamb of God, I poor sinner, I adore and venerate Your Most Holy Plague you received on the Shoulder in carrying the very heavy Cross of Calvary, in which three Most Sacred Bones were discovered, tolerating immense pain in it; I beg you, by virtue and merits of said Plague, to have mercy on me by forgiving me all my sins, both mortal and venial, to assist me at the hour of death and to lead me into your blessed kingdom.

Prayer to ask for a grace
Most beloved my Lord Jesus Christ, gentle Lamb of God, I poor sinner I adore you and consider the most painful plague of your shoulder opened by the heavy cross that you carried for me. I thank you for your immense gift of love for redemption and I hope the graces that you promised to those who contemplate your passion and the atrocious wound of your shoulder. Jesus, my Savior, encouraged by You to ask for what I desire, I ask You for the gift of Your Holy Spirit for me, for all your Church, and for grace (… ask for the desired grace); let it be all for Your glory and my greatest good according to the FATHER'S Heart. Amen. three Pater, three Ave, three Gloria.

Saint Bernard, Abbot of Chiaravalle, asked in prayer to Our Lord what the greatest pain had suffered in the body during his Passion. He was answered: “I had a wound on my shoulder, three fingers deep, and three bones discovered to carry the cross: this wound gave me greater pain and pain than all the others and is not known by men. But you reveal it to the Christian faithful and know that any grace they will ask of me by virtue of this plague will be granted to them; and to all those who for love of it will honor me with three Pater, three Ave and three Gloria a day I will forgive venial sins and I will no longer remember mortals and will not die of sudden death and on their deathbed will be visited by the Blessed Virgin and will achieve grace and mercy ”.