Writing concerning the Feastday of Our Lady of Lourdes, Dom Gueranger writes:
My bow shall appear in the clouds and I will remember My covenant with you. The lessons at Matins on February 11, 1854 (Thursday in Sexagesima week) recalled these words, and the world soon learned that on this very day Mary had appeared, more fair than the sign of hope which typified her at the time of the deluge.
During the year 1858, our Blessed Lady appeared eighteen times from February 11, 1858, to July 16, 1858, to Bernadette Soubirous, the fourteen-year-old daughter of a destitute day labourer of Lourdes in France. Through this humble child, the Mother of God announced to the world her sublime title of the Immaculate Conception and a special message of penance and love.
On March 25, 1858, the Virgin Mary appeared to St. Bernadette and said, "I am the Immaculate Conception." This occurred shortly after the declaration of Our Lady as Immaculate, and Church authorities were astonished that an uneducated child would know what it meant when it was not yet even readily taught. St. Bernadette died at the age of 35 on April 16, 1879. Her body remains incorrupt today.
The Church has officially approved these apparitions as authentic. A feastday in honour of Our Lady of Lourdes was approved by Pope Leo XIII and first granted to the Diocese of Tarbes in the year 1890. And Pope St. Pius X in 1907 extended the feastday of Our Lady of Lourdes to the entire Church to be celebrated on February 11th of each year.
Since the apparitions, countless people have journeyed to Lourdes, France to be healed in the waters of the Grotto where Mary appeared. Many of them have been healed. The process for healing to be declared a miracle is very intense but dozens of people have already been formally declared healed because of the miraculous water at Lourdes.
In February 2019, the 70th official healing was declared by the authorities. The French bishop Jacques Benoit-Gonnin of the Beauvais diocese declared that the 79-year-old nun, Sr. Bernadette Moriau, who was disabled for over 40 years, was miraculously healed by the waters of Lourdes.
In a video published on the diocese’s website, Sister Moriau declared that as she returned home after a pilgrimage to Lourdes, she heard a voice telling her to remove her leg braces. Immediately after that, she was able to walk on her own again. After a careful examination by physicians and experts, no earthly cause could explain her recovery. And similar stories have occurred for the other 69 approved miracles.
February 11 is therefore also World Day for the Sick.
O God, Who by the Immaculate Conception of the Virgin didst prepare a worthy dwelling for Thy Son: we humbly beseech Thee, that we, who celebrate the Apparition of this same Blessed Virgin, may obtain health of soul and body. Through our Lord.
Prayer Source: 1962 Roman Catholic Daily Missal