Something to do whilst waiting for a red light

Our Lord told St. Gertrude the Great, that the following prayer would release 1,000 souls from Purgatory each time it is said:

Eternal Father,
I offer Thee the Most Precious Blood of Thy Divine Son, Jesus,
in union with the Masses said throughout the world today,
for all the Holy Souls in Purgatory,
for sinners everywhere,
for sinners in the Universal Church,
those in my own home and within my family. Amen.

Who was St. Gertrude the Great?

Born in 1256, St. Gertrude died at age 46 on November 17, 1302. At the age of five she began to study at the convent, most likely because she had become an orphan. As she reached her early twenties, she began to be burned out on religious life and then she had a conversion.  Soon thereafter,  she began to have visions which lasted through the remaining years of her life.

St. Gertrude was never formally canonized, but a liturgical office of prayer, readings, and hymns in her honor was approved by Rome in 1606. Pope Benedict XIV gave her the title "the Great" to distinguish her from another famous Catholic Gertrude (Abbess Gertrude of Hackeborn who was little Gertrude's teacher) and to recognize the depth of her spiritual and theological insight.

The Life and Revelations of St. Gertrude can be found on the internet. While they do not contain the specific prayer set forth above, it appears to be a paraphrase of various passages and a common theme running through her writing:

Nevertheless, as I gathered up all my strength to make a last effort to gain Thee by my loving caresses, I perceived that all this was of no avail, until I commenced praying for sinners, for the souls in Purgatory, or for those who were in any affliction, when I knew that I was heard; but still more one evening, when I formed the resolution of commencing the prayers which I say for the deceased offering them for those most beloved by Thee, with the Collect, Omnipotens, sempiterne Deus, cui nunquam sine spe, instead of commencing, as I had been accustomed to do, by praying for those related to me, with the Collect, Deus, qui nos patrem et matrem, and it seemed to me that this change was very pleasing to Thee. Book Two, Chapter 15.

At the hour at which the Saint was to communicate was now near, she prayed God to show mercy to as many sinners as would be saved (for she dared not to pray for the reprobate) as He had that day delivered souls from Purgatory by the merit of the prayers which had been offered. But Our Lord reproved her timidity, saying: Is not the offering of My spotless Body and My precious Blood sufficient merit to recall even those who walk in the ways of perdition to a better life? Then Gertrude, reflecting on the infinite goodness testified by these words, exclaimed: "Since Thine ineffable charity will condescend to my unworthy prayers, I beseech Thee to deliver as many persons who live in sin and are in peril thereby as Thou hast delivered souls in Purgatory, without preferring those who are my friends with we by consanguinity or proximity". Our Lord accepted this petition graciously and certified its acceptance to her. "I would know further, I Lord," she continued, "what I shall add to these prayers to make them yet more efficacious?" Then, as she received no answer, she continued: "Lord. I fear that my unfaithfulness does not merit a reply to this question because Thou, who seest the hearts of all, knowest that I will not comply with Thy command." Then Our Lord, turning towards her with a countenance full of sweetness, replied: Confidence alone can easily obtain all things, but if your devotion urges you to add anything further, say the Psalm Laudate Dominum, omnes gentes three hundred and sixty-five times, in order to supply for those praises which men fail in offering Me. Book 3, Chapter 8.

The Psalm Laudate Dominum is Psalm 117:

Praise the Lord, all nations;

Praise Him, all people.

For He has bestowed

His mercy upon us,

And the truth of the Lord endures forever.

Glory to the Father and to the Son and to the Holy Spirit,

as it was in the beginning, is now, and forever,

and for generations of generations.

Amen.

So, if your devotion urges you to do so, consider saying the prayer of St. Gertrude the Great and repeat the above Psalm 365 times.