Praying heart, guardian of gratuity, wealth of apostolic fruitfulness and of a mysterious and multiform holiness, is the feminine contemplative life in the Church. The Contemplative life of nuns, rooted in the silence of the cloister, from its beginnings through a mysterious apostolic fruitfulness, enriches the Church of Christ with fruit of grace and mercy. With our gaze turned to this unique form, the sequela Cristi, Pope Pius XII published the Apostolic Constitution; sponsa Christi Ecclesia on November 21, 1950, with feminine monastic life as the object. In this document, the Roman Pontiff recognized the monasteries of nuns as true autonomous monasteries and advocated the birth of the Federations as structures of communion to overcome the isolation of monasteries, in order to favor the conservation of the comon charis and collaboration in various forms of reciprocal help, giving indications for the accomodata renovatio of what was defined as the Institute of nuns, above all on the issue of cloister.