“Apostle of My mercy, proclaim to the whole world My unfathomable mercy. Do not be discouraged by the difficulties you encounter in proclaiming My mercy. These difficulties that affect you so painfully are needed for your sanctification and as evidence that this work is Mine. My daughter, be diligent in writing down every sentence I tell you concerning My mercy, because this is meant for a great number of souls who will profit from it.” (Diary 1142)
The Lord asked Sister Faustina to write an important prophecy leading to Christ Second Coming.
“Write this: before I come as the just Judge, I am coming first as the King of Mercy. Before the day of justice arrives, there will be given to people a sign in the heavens of this sort:
All lights in the heavens will be extinguished, and there will be great darkness over the whole earth. Then the sign of the cross will be seen in the sky, and from the openings where the hands and the feet of the Savior where nailed will come forth great lights which will light up the earth for a period of time. This will take place shortly before the last day.” (Diary 83)
Many mystics have announced the prophecy, including Padre Pio and Blessed Anna-Maria Taigi. When an identical prophecy is made by widely separated mystics in time and space, the prophecy was accompanied by other fulfilled prophecies, and the holiness of the mystics has been recognized by the Church, we should believe the prophecy must come to pass.