Jesus told St. Faustina:
But God has promised a great grace ...
to all those "... who will proclaim My great mercy.
I shall protect them Myself at the hour of death, as My own glory.
And even if the sins of souls were as dark as night,
when the sinner turns to My mercy,
he gives Me the greatest praise and is the glory of My Passion.
When a soul extols My goodness,
Satan trembles before it and flees to the very bottom of hell. "
(378)
From the Diary of St. Faustina
A promise that makes Satan tremble
A promise that makes Satan tremble
Devotion to the souls in Purgatory contains in itself all the works of mercy, which supernaturalized by a spirit of faith, should merit us Heaven. de Sales