Apostolic Succession Explained; A Short Treatise in which Certain Theological Questions of the Day are Calmly Examined and Resolved, by a Priest of the Order of Charity (London, Dublin, Derby: Thomas Richardson and Son, 1850). Available at Google Play Books.
Patrology: The Lives and Works of the Fathers of the Church, by Professor Otto Bardenhewer, D.D., Ph.D., translated from the 2nd edition by Professor Thomas Joseph Shahan, D.D. (Freiburg im Breisgau; St. Louis, Mo.; Karlsruhe; Munich; Strassburg; Vienna: B. Herder, 1908). With Imprimatur, and with the approbation and recommendation of various archbishops and bishops. May be read online, and available in pdf, mobi, epub and other formats, at Open Library and Internet Archive, with a 2nd copy at Internet Archive, a 3rd copy at Internet Archive, and a 4th copy at Internet Archive.
가톨릭 영상 교리 / Video Catechism of the Catholic Church, in Korean (한국어), English, and sign language, produced by the Catholic Pastoral Institute of Korea and the Catholic Peace Broadcasting Corporation. Approved by the Catholic Bishops Conference of Korea, 2020.
(Note: According to the English webpage, “The arrangement of this Video Catechism is different from that of the Catechism of the Catholic Church, and was produced as a support material to be used in the catechesis. Therefore, it is recommended that priests, religious, and catechists fully explain the content of the Catechism and utilize this video to support catechisis in the Catechumenate, re-education of the faithful, and Sunday school catechesis.”)
“[T]he Church has always looked on catechesis as a sacred duty and an inalienable right… [I]t is certainly a duty springing from a command given by the Lord and resting above all on those who in the New Covenant receive the call to the ministry of being pastors… [O]ne can likewise speak of a right: from the theological point of view every baptized person… has the right to receive from the Church instruction and education enabling him or her to enter on a truly Christian life; and from the viewpoint of human rights, every human being has the right to seek religious truth and adhere to it freely…
The specific character of catechesis, as distinct from the initial conversion-bringing proclamation of the Gospel, has the twofold objective of maturing the initial faith and of educating the true disciple of Christ by means of a deeper and more systematic knowledge of the person and the message of our Lord Jesus Christ… It is true that being a Christian means saying ” yes ” to Jesus Christ, but let us remember that this “yes” has two levels: it consists in surrendering to the word of God and relying on it, but it also means, at a later stage, endeavoring to know better and better the profound meaning of this word.
“Authentic catechesis is always an orderly and systematic initiation into the revelation that God has given of himself to humanity in Christ Jesus, a revelation stored in the depths of the Church’s memory and in Sacred Scripture, and constantly communicated from one generation to the next by a living active traditio…” (Saint John Paul the Great, Apostolic Exhortation “Catechesi Tradendae”)
“Care of Souls and the Logic of Trent as a Pastoral Council”, by Dr. V.U. [Valentine U.] Iheanacho, Acta Theologica, vol. 39, no. 1 (June 2019): pp. 94-109. Available in pdf format on this page of Acta Theologica.
“The Greek and Latin Traditions regarding the Procession of the Holy Spirit”, by the Pontifical Council for Promoting Christian Unity, L’Osservatore Romano, Weekly Edition in English, 20 September 1995, page 3. May be read online on this page of the EWTN Library.
“But when 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)