He told her, "My divine Heart is so inflamed with love for mankind ... that it can no longer contain within itself the flames of its burning charity and must spread them abroad by your means."
Margaret Mary was told to propagate a devotion to His Sacred Heart. Connected to this devotion, Jesus gave twelve promises for devotees:
I will give them all the graces necessary for their state of life
I will establish peace in their families.
They shall find in My Heart an assured refuge during life and especially at the hour of their death.
Sinners shall find in My Heart the source of an infinite ocean of mercy.
Fervent souls shall speedily rise to great perfection.
I will give to priests the power of touching the most hardened hearts.
The all-powerful love of My Heart will grant to all those who shall receive Communion on the First Friday of nine consecutive months the grace of final repentance; they shall not die under my displeasure, nor without receiving their Sacraments; My heart shall be their assured refuge at that last hour.