Compiled by Susan Peek (the author of saint stories for children and teens).
 
Beautiful devotion for the Souls in Purgatory dating back to the 17th century. The purpose of this Daily Pilgrimage to Purgatory is to obtain relief and deliverance from Purgatory for the Holy Souls. Its secondary aim is to attain personal holiness, convert sinners, and acquire necessary spiritual and temporal graces. 
Saint Margaret Mary wrote: “In union with the divine Heart of Jesus, make a short pilgrimage to Purgatory at night. Offer Him all your activities of the day and ask Him to apply His merits to the suffering souls. At the same time, implore them to obtain for you the grace to liveand die in the love and friendship of this divine Heart. May He never find in you any resistance to His holy will, or any wish to thwart His designs in your regard. Fortunate will you be, if you succeed in obtaining deliverance for some of these imprisoned souls, for you will gain as many friends in heaven.” 
This pious practice, which Saint Margaret Mary recommended to her novices for the octave of All Souls, was introduced to the members of the Arch-confraternity of Our Lady of the Sacred Heart in the year 1885. Since then, many of the faithful have made this pilgrimage daily.
In 1884, his Eminence, Cardinal Monaco la Valette, Vicar General of His Holiness, sanctioned the propagation of the Daily Pilgrimage to Purgatory. May it please the divine Heart of Jesus to use this booklet as a means of spreading this work of sympathetic love for all the Holy Souls. May this most benevolent of hearts extend the fullness of His graces and blessings to all who, in any way, assist in its circulation.