Provida Mater Ecclesia
Provida Mater Ecclesia was an apostolic constitution by Pope Pius XII, that recognized secular institutes as a new form of official consecration in the Catholic Church. Promulgated on February 2, 1947, the constitution recognized secular consecration; that is, it recognized that lay men and lay women could, while remaining "in the world", live consecrated lives– which hitherto had been held to be possible only as a religious.