As far as Martin [Luther] himself is concerned, O good God, what have we overlooked or not done? What fatherly charity have we omitted that we might call him back from such errors?
Pope Leo XTo deny that in a child after baptism sin remains is to treat with contempt both Paul and Christ.
Pope Leo XIt has always been the habit of Catholic in danger and in troublous times to fly for refuge to Mary, and to seek for peace in Her maternal goodness; showing that the Catholic Church has always, and with justice, put all her hope and trust in the Mother of God. And truly the Immaculate Virgin, chosen to be the Mother of God and thereby associated with Him in the work of man's salvation, has a favour and power with Her Son greater than any human or angelic creature has ever obtained, or ever can gain
Pope Leo XWe have devoted ourselves to the government and extension of the Church, and, among other objects, we have conceived it to be our duty to foster especially literature and the fine arts ... next to knowledge and true worship of the Creator, nothing is better or more useful to mankind than such studies.
Pope Leo XThis devotion, so great and so confident, to the august Queen of Heaven, has never forth with such brilliancy as when the militant Church of Go has seemed to be endangered by the violence of heresy spread abroad, or by an intolerable moral corruption, or by the attacks of powerful enemies. Ancient and modern history and the more sacred annals of the Church bears witness to public and private supplications addressed to the Mother of God, to help She has granted in return, and to the peace and tranquillity which She has obtained from God.
Pope Leo X