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The new agency, by mandate of an Apostolic Letter, is charged with monitoring the monetary and commercial activities of Vatican agencies, such as the Governorate of Vatican City State, the Vatican Bank, the Administration of the Patrimony of the Apostolic See, the Congregation for the Evangelization of Peoples, and smaller agencies such as the Vatican Pharmacy, the Vatican Supermarket, and the Vatican Museums.
And in his Apostolic Letter, Rosarium Virginis Mariae Pope John Paul II discussed the inspiration of the rosary and how his motto Totus Tuus was inspired by the Mariology in the writings of Saint Louis de Montfort.
Exposcit Debitum (Latin for The Duty requires) is the title of the Papal bull (or 'Apostolic Letter') that gave a second and final approval to the foundation of the Society of Jesus (the Jesuits).
The publication of the Apostolic letter Ea Semper, which dealt with the Eastern Rite Catholics in the United States, led to a number of defections to the Russian Orthodox Church in America.
According to his Apostolic Letter Rosarium Virginis Mariae, the pontif's personal motto "Totus Tuus" was inspired by St. Louis' doctrine on total consecration to the Virgin Mary.