Jesus revealed to St. Faustina the special significance of the three o'clock hour — the hour of His death on the Cross — as a time of extraordinary grace for the whole world: "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. I will allow you to enter into My mortal sorrow. In this hour, I will refuse nothing to the soul that makes a request of Me in virtue of My Passion." (Diary 1320). He also said: "As often as you hear the clock strike the third hour, immerse yourself completely in My mercy, adoring and glorifying it; invoke its omnipotence for the whole world, and particularly for poor sinners; for at that moment mercy was opened wide for every soul." (Diary 1572). This devotional practice has been embraced by millions of Catholics worldwide.