The first revelation probably took place in the morning of December 27, 1673. It indicates how intense was the divine desire to save men through devotion to the Sacred Heart. The saint recounts:

“One day, praying before the Blessed Sacrament … I felt myself wholly penetrated with that Divine Presence… and abandoned myself to this Divine Spirit, yielding up my heart to the power of His Love. He made me repose for a long time upon His Sacred Breast, where He disclosed to me the marvels of His love and the inexplicable secrets of His Sacred Heart…” He said to me:

“My Divine Heart is so inflamed with love for men, and for you in particular that, being unable any longer to contain within Itself the flames of Its burning Charity, It must needs spread them abroad by your means, and manifest Itself to men in order to enrich them with the precious graces of sanctification and salvation necessary to withdraw them from the abyss of perdition. I have chosen you as an abyss of unworthiness and ignorance for the accomplishment of this great design, in order that everything may be done by Me.”

The First Revelation

“After this He asked me for my heart, which I begged Him to take. He did so and placed it in His own adorable Heart where He showed it to me as a little atom which was being consumed in this great furnace, and withdrawing it thence as a burning flame in the form of a heart, He restored it to the place whence He had taken it saying to me:

“’My well-beloved, I give you a precious token of My love, having enclosed within your side a little spark of its glowing flames, that it may serve you for a heart and consume you to the last moment of your life… As a proof that the great favour I have done to you is not imagination, and that it is the foundation of all those which I intend further to confer upon you, although I have closed the wound in your side, the pain will always remain. If before, you have taken only the name of my slave, I now give you that of the beloved disciple of My Sacred Heart.”