It is Jesus’ desire that the moment of His Death on the Cross (3pm) be venerated every day.
“At three o’clock, implore My mercy, especially for sinners; and, if only for a brief moment, immerse yourself in My Passion, particularly in My abandonment at the moment of agony. This is the hour of great mercy for the whole world . . . In this hour, I will refuse nothing to the soul that makes a request of Me in virtue of My Passion. . . .” (Diary 1320) “You can obtain everything for yourself and for others for the asking; it was the hour of grace for the whole world – mercy triumphed over justice.” (Diary 1572)
Jesus instructed Saint Faustina, “Try your best to make the Stations of the Cross in this hour, provided that your duties permit it; and if you are not able . . . then at least step into the chapel for a moment and adore, in the Blessed Sacrament, My Heart, which is full of mercy; should you be unable to step into the chapel, immerse yourself in prayer there where you happen to be, if only for a very brief instant.” (Diary 1572)
Jesus laid down three conditions necessary for the prayers which shall be offered up at the hour of mercy in order for them to be heard and answered; the prayer is to be directed to Him, it is to take place at 3pm, and it is to appeal to the merits of His Passion. Furthermore, it is to be a prayer full of trust and accompanied by works of mercy toward one’s neighbour.
Appropriate prayers for the Hour of Mercy, frequently recited by Saint Faustina, would be:
* You expired, Jesus, but the source of life gushed forth for souls, and the ocean of mercy opened up for the whole world. O Fount of Life, unfathomable Divine Mercy, envelop the whole world and empty Yourself out upon us. (Diary 1319)
* O Blood and Water, which gushed forth from the Heart of Jesus as a fount of mercy for us, I trust in You. (Diary 84)