This time of sorrow, mourning and difficulty was succeeded by a period of unwonted activity. It was deemed expedient to convoke an Œcumenical Council. This important measure was thought of on occasion of the centenary celebration of the martyrdom of SS. Peter and Paul. After two years of serious and mature deliberation and consultation, Pius IX. issued apostolical letters, convening a council of the whole church at the Vatican Basilica. The 8th of December, 1869, was appointed as the day for its first assembling. The objects in view cannot be better described than in the words of the venerable Pontiff. After a few preliminary paragraphs in his Bull of Indiction, the Holy Father thus proceeds: “The Roman Pontiffs, in the discharge of the office divinely confided to them in the person of Peter of feeding the entire flock of Christ, have unweariedly taken on themselves the most arduous labors, and used every possible means in order to have the various nations and races all over the earth brought to the light of the Gospel, and by truth and holiness to eternal life. All men know the zeal and unceasing vigilance with which these same Roman Pontiffs have kept inviolate the deposit of faith, discipline among the clergy, purity and science in the education given to the members of the church, the holiness and dignity of Christian marriage: how they studied day by day to promote the Christian education of the youth of both sexes, to foster among all classes the love of religion, the practice of piety and purity of morals as well as everything that might conduce to the tranquillity, the good order and the prosperity of civil society. Whenever great troubles arose, or serious calamities threatened either the church or social order, the Roman Pontiffs judged it opportune to convoke general councils, in order that with the advice and assistance of the bishops of the Catholic world, whom the Holy Ghost hath established to rule the Church of God, they might, in their united wisdom and forethought, so dispose everything as to define the doctrines of faith, to secure the destruction of the most prevalent errors, defend, illustrate and develop Catholic teaching, restore and promote ecclesiastical discipline and the reformation of morals.