Born as Eugenio Maria Giuseppe Giovanni Pacelli.
The Venerable Pope Pius ХII proclaimed ex cathedra in his 1950 Apostolic constitution
the dogma of the Assumption of Virgin Mary.
Msgr. Eugene Pacelli, the future Pope Pius ХII:
“I am worried by the Blessed Virgin's messages to Lucy of Fatima. This persistence of Mary about the dangers which menace the Church is a divine warning against the suicide of altering the Faith, in Her liturgy, Her theology and Her soul.
I hear all around me innovators who wish to dismantle the Sacred Chapel, destroy the universal flame of the Church, reject Her ornaments and make Her feel remorse for Her historical past.
A day will come when the civilized world will deny its God, when the Church will doubt as Peter doubted. She will be tempted to believe that man has become God. In our churches, Christians will search in vain for the red lamp where God awaits them. Like Mary Magdalene, weeping before the empty tomb, they will ask, 'Where have they taken Him?'”
20. Nor must it be thought that what is expounded in Encyclical Letters does not of itself demand consent, since in writing such Letters the Popes do not exercise the supreme power of their Teaching Authority. For these matters are taught with the ordinary teaching authority, of which it is true to say:
"He who heareth you, heareth me"
(Luke, X, 16);
and generally what is expounded and inculcated in Encyclical Letters already for other reasons appertains to Catholic doctrine. But if the Supreme Pontiffs in their official documents purposely pass judgment on a matter up to that time under dispute, it is obvious that that matter, according to the mind and will of the Pontiffs, cannot be any longer considered a question open to discussion among theologians.
Papal encyclical concerning some false opinions threatening
to undermine the foundations of Catholic Doctrine
44. … This is a deep mystery, and an inexhaustible subject of meditation, that
the salvation of many depends on the prayers and voluntary penances
which the members of the Mystical Body of Jesus Christ offer for this intention and on the cooperation of pastors of souls and of the faithful, especially of fathers and mothers of families, a cooperation which they must offer to our Divine Savior as though they were His associates.