See this legally free ebook:

  • A Letter Addressed to His Grace the Duke of Norfolk, on Occasion of Mr. Gladstone’s Recent Expostulation, by Saint John Henry Newman (London: B.M. Pickering, 1875). May be read online, and available in pdf, mobi, epub and other formats, at Internet Archive.
    • The text may also be read online through this page of Newman Reader, as the second section of Volume II of the author’s Certain Difficulties Felt by Anglicans in Catholic Teaching (London, New York, Bombay: Longmans, Green, and Co., 1900) (Copyright © 2007 by The National Institute for Newman Studies).
    • Under the title Dr. John Henry Newman’s Reply to Mr. Gladstone’s Pamphlet (Toronto: A. S. Irving & Co., 1875), it is available at Internet Archive.

See also the texts listed on the post “Online text: “The Primacy of the Successor of Peter in the Mystery of the Church”, by Congregation for the Doctrine of the Faith” and “Online text: “The Martyrological Dimension of Petrine Primacy”, by Jakub J. Woźniak“, and those in sub-list IV.B on the page Church and Ecclesiology.

On the Feast of Saints Peter and Paul in the one true and Catholic Church. For other texts and ebooks, you may access the List of Free eBooks (Arranged by Title), the List of Free eBooks (Grouped by Subject), the List of Worth-It Catholic Books & eBooks, and the main page of the Catholic eBooks Project.

“The Petrine ministry is… a primacy of love in the eucharistic sense, that is to say solicitude for the universal communion of the Church in Christ. And the Eucharist is the shape and the measure of this communion, a guarantee that it will remain faithful to the criterion of the tradition of the faith…. The sacred Scriptures, authoritatively interpreted by the Magisterium in the light of the Fathers, shed light upon the Church’s journey through time, providing her with a stable foundation amid the vicissitudes of history.” (Pope Benedict XVI, Homily on the Feast of the Chair of Saint Peter, 19 February 2012)