Outside of devotions to the Blessed Virgin Mary, there is none more popular or more identified with the traditional piety of Catholic life than this feast, occurring on Friday of the week following the Feast of Corpus Christi. It was on that earlier feast when a Novena to the Sacred Heart would begin, culminating in the Mass and Office of today.
“Christ’s open side and the mystery of blood and water were meditated upon, and the Church was beheld issuing from the side of Jesus, as Eve came forth from the side of Adam. It is in the eleventh and twelfth centuries that we find the first unmistakable indications of devotion to the Sacred Heart. Through the wound in the side, the wounded Heart was gradually reached, and the wound in the Heart symbolized the wound of love.” (1917 Catholic Encyclopedia)
There were various monastic communities who took up the devotion since the eleventh century, but the real tip of the biretta has always gone to St Margaret Mary Alacoque (1647-90), a Visitation nun who had a vision. While praying before the Blessed Sacrament, she saw Our Lord with his heart beating openly, and the sight of it all sent her into a spell of ecstasy. “He disclosed to me the marvels of his Love and the inexplicable secrets of his Sacred Heart.” And so it was, with local approval, that the Feast itself was first officially celebrated in Rennes, France. This was followed by papal approval, with official texts for the Mass and Office, in Poland and Portugal. Its popularity spread across Europe. Then in 1856, Pope Pius IX established the Feast of the Sacred Heart as obligatory for the whole Church, to be celebrated on the Friday after the Octave of Corpus Christi. The octave was suppressed during the 1955 calendar reforms of Pope Pius XII, along with most existing octaves*, and yet the novena that precedes this feast is rising in popularity among traditional Catholics in the West.
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But perhaps the finest explanation of this vision can be found in an episode of The X-Files, a detective series that ran on The Fox Network for nine years, and to this day has a formidable cult following. It is from the series' sixth season and is entitled "Milagro" (6X18), originally airing on April 18, 1999. In the story, there are people murdered with their hearts mysteriously removed by hand. FBI Special Agent Dana Scully (Gillian Anderson) visits a Catholic church, and coming across the image of the Sacred Heart, she runs into this unsavory fellow who explains the story behind the image to her. A piece of the dialogue, from the mysterious writer named Philip Padgett (John Hawkes), describes a vision:
I often come here to look at this painting. It’s called “My Divine Heart” after the miracle of Saint Margaret Mary. Do you know the story ... The revelation of the Sacred Heart? Christ came to Margaret Mary, his heart so inflamed with love that it was no longer able to contain its burning flames of charity. Margaret Mary ... so filled with divine love herself, asked the Lord to take her heart ... and so he did, placing it alongside his until it burned with the flames of his passion. Then he restored it to Margaret Mary, sealing her wound with the touch of his blessed hand.
His account portrays an almost sensuous quality to the Saint's reaction to this vision, in a way that one might rarely hear or read anywhere else. It is a sign that perhaps the influence of Christendom has not entirely faded from the popular culture, not to mention the realm of folk religion, with images created in tattoo parlors.
A common practice in many Catholic homes until the mid-20th century (including mine), was the "Enthronement of the Sacred Heart," in which the family placed the appropriate image of Christ on the wall, and together recited the necessary prayers, pledging the consecration of the family and the home to Him, in return for special graces. Fisheaters has a good explanation of the complete package, just in case it makes a comeback.
It could happen.
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* The suppression of most octaves in the liturgical calendar by Pius XII has recently become a matter of much debate, attributing it to an overzealous agenda within the Liturgical Movement. However, it may have also been the result of conflicts between at least some of those octaves, and commemorations of equal or greater rank occurring at the same time -- but, that's another story.