St. Mechtilde. This saint gives the following account of a revelation which she received about this devotion:

In the preface to this book we have given reasons why prudent men should not refuse to give credence to the revelations of  St. Mechtilde. This saint gives the following account of a revelation which she received about this devotion:

"One day I saw the Son of God, holding in His Hand His own Heart, which appeared more brilliant than the sun and which was casting rays of light on every side; then, this amiable Savior gave me to understand that all the graces which God unceasingly pours forth on men, according to the capacity of each, come from the plenitude of the Divine Heart."

And this same Saint, a short time before her death, declared that having one day earnestly asked Our Lord for some great favor for a person who had asked her to do so, Jesus Christ said to her: "My child, tell that person for whom you are praying to Me, to seek in My Heart all that she desires; tell her to have a great devotion to My Sacred Heart, and to ask for everything in this same Heart, like a child asking its father for everything it wants, knowing no other artifice but what love suggests to it." [Liber Specialis Gratiae, Pt. IV. Chap. 28].

The Devotion to the Sacred Heart
Fr. John Croiset, S. J. 
Originally published in1691; 
Nihil Obstat and Imprimatur, 1959 
TAN Books and Publishers