See this legally free ebook:

  • God Our Father, by a Father of the Society of Jesus (Rev. F.J. Boudreaux, S.J.) (London: Burns and Oates, 1878). May be read online, and available in pdf, epub, mobi, and other formats, at Internet Archive. An earlier impression (Baltimore: John Murphy & Co.; New York: Catholic Publication Society, 1873) with Imprimatur and superior’s approbation is available at Internet Archive and Open Library.

See also these other texts relating to God the Father:

See also these texts and audio on the Lord’s Prayer (“Our Father”, “Pater Noster”):

  • The Lord’s Prayer, by Frederick N. Lynk, S.V.D. (Techny, Illinois: Mission Press, S.V.D., 1915). May be read online, and available in pdf, epub, mobi, and other formats, at Internet Archive. [Legal Notice: We believe that this work is in the public domain in the United States in view of its year of publication; but we are uncertain if it is in the public domain in other jurisdictions, as we are unable to determine the year of the author’s decease. Advice on this point would be highly appreciated.]
  • The Lord’s Prayer, by Peter Kreeft (New Haven, CT:  Knights of Columbus Supreme Council—Catholic Information Service, 2001). With Imprimatur. The audiobook may be listened to, and is available in mp3 format, and the ebook may be viewed online and is available in pdf format, at the Catholic Information Service of the Knights of Columbus.
  • The “Our Father”: A Booklet for Young and Old, from the German of F.X. Wetzel (St. Louis, Mo., B. Herder, 1899). May be read online, and available in pdf, epub, mobi, and other formats, at Internet Archive. [No Imprimatur, but printed by a reliably faithful and orthodox publishing house]
  • The Our Father, Analyzed According to the Doctrine of St. Thomas Aquinas, by Rev. J.G. Haen, S.J., translated by a Visitation Nun (New York, Cincinnati, Chicago: Benziger Brothers, 1903). With Imprimatur. May be read online, and available in pdf, epub, mobi, and other formats, at Internet Archive.
  • Saint Teresa’s Pater Noster: A Treatise on Prayer, by Joseph Giuseppe Frassinetti, translated by William Hutch, D.D. (London: Burns & Oates; New York: Catholic Publication Society Co., 1887). With Imprimatur. May be read online, and available in pdf, epub, mobi, and other formats, at Internet Archive.

See also these texts relating to the Blessed Trinity:

Posted for the Feast of the Holy Trinity in the one true and Catholic Church; and in solidarity with the celebration of Father’s Day in the United States and other nations. [N.B., And is it not a gift of our provident Lord that, in this evil year when both the Divine Paternity and men’s spiritual and physical fatherhood are obscured by error and sin, Father’s Day is being celebrated on the same day as the Solemnity of the Triune God? Pater noster, sanctificetur nomen Tuum!]

For other online texts and legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject).

[G]o out, making disciples of all nations, and baptizing them in the name of the Father, and of the Son, and of the Holy Ghost, teaching them to observe all the commandments which I have given you.” (St. Matthew xxviii, 19-20)

[W]hen he, the Spirit of truth, is come, he will teach you all truth… All things whatsoever the Father hath are mine. Therefore, I said, that he shall receive of mine, and will shew it to you” (St. John xvi, 13, 15)