After Alacoque the devotion to the Sacred Heart was fostered by the Jesuits and the subject of controversies within the Church.
The practice was not officially recognized until 75 years later.

The discussion of Alacoque's own mission and qualities continued for years.
All her actions, her revelations, her spiritual maxims, her teachings regarding the devotion to the Sacred Heart, of which she was the chief exponent as well as the apostle, were subjected to the most severe and minute examination, and finally the Sacred Congregation of Rites passed a favourable vote on the heroic virtues of this "servant of God".
In March 1824, Pope Leo XII pronounced her Venerable and on 18 September 1864 Pope Pius IX declared her Blessed.
 When her tomb was canonically opened in July 1830, two instantaneous cures were recorded to have taken place.
Her incorrupt body rests above the side altar in the Chapel of the Apparitions, located at the Visitation Monastery in Paray-le-Monial, and many striking blessings have been claimed by pilgrims attracted there from all parts of the world.

Alacoque was canonized by Pope Benedict XV in 1920, and in 1929 her liturgical commemoration was included in the General Roman calendar for celebration on 17 October, the day of her death.
In the reforms of 1969, the feast day was moved to the prior day, 16 October.

In his 1928 encyclical Miserentissimus Redemptor, Pope Pius XI affirmed the Church's position regarding the credibility of her visions of Jesus Christ by speaking of Jesus as having "manifested Himself" to Saint Margaret Mary and having "promised her that all those who rendered this honour to His Heart would be endowed with an abundance of heavenly graces".

Alacoque's short devotional writing, La Devotion au Sacré-Coeur de Jesus (Devotion to the Sacred Heart of Jesus), was published posthumously by J. Croiset in 1698, and has been popular among Catholics.

Mariologists refer to Saint Marguerite Marie Alacoque as "living proof how Marian devotion is linked to 'Christology'" and the adoration of Jesus Christ.

On the Caribbean Island of Saint Lucia there are two flower festivals supported by their Societies.
 Each society has a patron saint on whose feast day the grande fete is celebrated.
For the Roses it is the feast of St. Rose of Lima on 30 August; and for the Marguerites it is that of St. Margaret Mary Alacocque, 17 October.
After Alacoque the devotion to the Sacred Heart was fostered by the Jesuits and the subject of controversies within the Church. The practice was not officially recognized until 75 years later.
The discussion of Alacoque's own mission and qualities continued for years. All her actions, her revelations, her spiritual maxims, her teachings regarding the devotion to the Sacred Heart, of which she was the chief exponent as well as the apostle, were subjected to the most severe and minute examination, and finally the Sacred Congregation of Rites passed a favourable vote on the heroic virtues of this "servant of God". In March 1824, Pope Leo XII pronounced her Venerable and on 18 September 1864 Pope Pius IX declared her Blessed.  When her tomb was canonically opened in July 1830, two instantaneous cures were recorded to have taken place. Her incorrupt body rests above the side altar in the Chapel of the Apparitions, located at the Visitation Monastery in Paray-le-Monial, and many striking blessings have been claimed by pilgrims attracted there from all parts of the world.
Alacoque was canonized by Pope Benedict XV in 1920, and in 1929 her liturgical commemoration was included in the General Roman calendar for celebration on 17 October, the day of her death. In the reforms of 1969, the feast day was moved to the prior day, 16 October.
In his 1928 encyclical Miserentissimus Redemptor, Pope Pius XI affirmed the Church's position regarding the credibility of her visions of Jesus Christ by speaking of Jesus as having "manifested Himself" to Saint Margaret Mary and having "promised her that all those who rendered this honour to His Heart would be endowed with an abundance of heavenly graces".
Alacoque's short devotional writing, La Devotion au Sacré-Coeur de Jesus (Devotion to the Sacred Heart of Jesus), was published posthumously by J. Croiset in 1698, and has been popular among Catholics.
Mariologists refer to Saint Marguerite Marie Alacoque as "living proof how Marian devotion is linked to 'Christology'" and the adoration of Jesus Christ.
On the Caribbean Island of Saint Lucia there are two flower festivals supported by their Societies.  Each society has a patron saint on whose feast day the grande fete is celebrated. For the Roses it is the feast of St. Rose of Lima on 30 August; and for the Marguerites it is that of St. Margaret Mary Alacocque, 17 October.
Margaret Mary Alacoque