The wound in My Heart
From all My wounds, like from streams, mercy flows for souls, but the wound in My Heart is the fountain of unfathomable mercy. From this fountain spring all graces for souls. The flames of compassion burn Me. I desire greatly to pour them out upon souls. Speak to the whole world about My mercy (Diary, 1190).
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