0 To Our Venerable Brethren the Patriarchs, Primates, Archbishops, and Bishops of the Whole World in Favour and Communion with the Apostolic See. Venerable Brethren, Health and Apostolic Benediction. We return thanks as is meet, to the sovereign goodness of God, Whose will and providential wish governs the whole of men's lives, that the fiftieth anniversary of Our priesthood has shown upon the Church. Moreover, the wonderful unanimity of hearts displayed in the tokens of respect, the liberal gifts, the public manifestations of readiness, is such as He alone could have inspired, on Whom entirely depends the spirits, the wills, and the hearts of men, and who rules and directs events for the glory of the Christian religion.
Source: Quod Anniversarius (Vatican.va)