Easter Vigil, also called the Paschal Vigil or the Great Vigil of Easter, is a service held in traditional Christian churches as the first official celebration of the Resurrection of Jesus. Historically, it is during this service that people are baptized and that adult catechumens are received into full communion with the Church. It is held in the hours of darkness between sunset on Holy Saturday and sunrise on Easter Day — most commonly in the evening of Holy Saturday or midnight — and is the first celebration of Easter, days traditionally being considered to begin at sunset.

In the Roman Catholic Church, Eastern Orthodox churches, Oriental Orthodox churches, the Anglican Communion, and Lutheran churches, the Easter Vigil is the most important service of public worship and Mass of the liturgical year; in the West it is the first celebration of the Gloria during the fifty-day long celebration of Easter, marked by the first use since the beginning of Lent of the exclamatory "Alleluia", a distinctive feature of the Easter season. Similarly, in the East, the extremely festive ceremonies and Divine Liturgy which are celebrated during the Easter Vigil are unique to that night and are the most elaborate and important of the ecclesiastical year and usher in the fifty-day long celebration and many people who only attend church services once a year do so at midnight for Easter.

Francis de Sales, T.O.M., A.O.F.M. Cap., (French: François de Sales) (August 21, 1567 – December 28, 1622) was a Bishop of Geneva and is honored as a saint in the Roman Catholic Church. He became noted for his deep faith and his gentle approach to the religious divisions in his land resulting from the Protestant Reformation. He is known also for his writings on the topic of spiritual direction and spiritual formation, particularly the Introduction to the Devout Life and the Treatise on the Love of God.

Francis de Sales was born on the 21 August 1567 in the Château de Sales into the noble Sales family of the Duchy of Savoy, in what is today Thorens-Glières, Haute-Savoie, France. His father was François de Sales, Lord of Boisy, Sales and Novel, and his mother was Françoise de Sionnz, the only child of a prominent magistrate. Because he was the first of six children, his father wanted him to attend the best schools, and he enjoyed a privileged education in the nearby towns of La Roche-sur-Foron and Annecy and his spiritual formation and academics were entrusted to the Jesuits. In 1583, he went to the Collège de Clermont in Paris.