Sources & Resources
CatholicKnow draws on the authoritative sources of the Catholic faith. Here is where our content comes from — and where you can go deeper.
How We Use Sources
CatholicKnow uses AI technology to present Catholic teaching in clear, accessible language. Our content is a faithful synthesis of official Church teaching — not a direct reproduction of source texts. When we cite a CCC paragraph number, a Scripture verse, or a Canon, the reference is accurate and verifiable.
We follow a strict source hierarchy: Sacred Scripture and the Catechism carry the highest authority, followed by papal documents and conciliar teachings, the Church Fathers and Doctors, and finally trusted Catholic reference works. We always distinguish between defined doctrine and theological opinion.
Primary Sources
The Holy Bible (Catholic Edition)
Sacred Scripture is the inspired Word of God and the foundation of all Catholic teaching. CatholicKnow references the New American Bible Revised Edition (NABRE), the translation approved for liturgical use in the United States, as well as the Revised Standard Version Catholic Edition (RSV-CE).
Read online at USCCBCatechism of the Catholic Church (CCC)
The official compendium of Catholic doctrine, promulgated by Pope John Paul II in 1992. When we cite 'CCC' followed by a paragraph number (e.g., CCC 1324), we are referencing this authoritative text. It covers the Creed, the Sacraments, the Moral Life, and Prayer.
Read online at Vatican.vaCode of Canon Law
The body of laws governing the Catholic Church, promulgated by Pope John Paul II in 1983. References to 'Canon' followed by a number (e.g., Canon 1247) cite this text. It governs sacramental practice, obligations, and Church governance.
Read online at Vatican.vaDocuments of the Second Vatican Council
The sixteen documents of Vatican II (1962–1965) remain essential for understanding the Church's self-understanding and mission in the modern world. Key documents include Lumen Gentium (on the Church), Dei Verbum (on Divine Revelation), Sacrosanctum Concilium (on the Sacred Liturgy), and Gaudium et Spes (on the Church in the Modern World).
Read at Vatican.vaPapal Documents
Papal Encyclicals & Apostolic Exhortations
Including Evangelii Gaudium (Pope Francis), Deus Caritas Est (Pope Benedict XVI), Redemptoris Mater and Veritatis Splendor (Pope John Paul II), Humanae Vitae (Pope Paul VI), and many others.
Read at Vatican.vaAmoris Laetitia
Pope Francis's 2016 apostolic exhortation on love in the family, referenced in our content on marriage, divorce, and pastoral accompaniment.
Read at Vatican.vaIndulgentiarum Doctrina
Pope Paul VI's 1967 apostolic constitution on indulgences, referenced in our FAQ on indulgences.
Reference Works
The Church Fathers
The writings of the early Church Fathers (1st–8th centuries) — including St. Ignatius of Antioch, St. Justin Martyr, St. Irenaeus, St. Athanasius, St. John Chrysostom, and others — provide crucial witness to the beliefs and practices of the early Church.
Doctors of the Church
The 37 Doctors of the Church — saints recognized for their outstanding contribution to theology and doctrine — are frequently referenced, especially St. Thomas Aquinas, St. Augustine, St. Jerome, St. Teresa of Ávila, St. Thérèse of Lisieux, and St. Catherine of Siena.
Butler's Lives of the Saints
The standard reference work on the lives of the saints, originally compiled by Alban Butler in the 18th century and revised through multiple editions. Our saint biographies draw on this and other hagiographic sources.
Roman Martyrology
The official list of saints and blesseds recognized by the Catholic Church, with their feast days.
Daily Prayer & Readings
USCCB Daily Readings
The official daily Mass readings from the United States Conference of Catholic Bishops. Our 'Today's Mass Readings' feature links directly to this source.
Universalis
Daily Mass readings, the Liturgy of the Hours, and the Church calendar for every day of the year.
iBreviary
The complete Liturgy of the Hours (Divine Office) available online and as a mobile app.
Recommended Catholic Resources
Catholic Answers
The largest lay-run Catholic apologetics and evangelization apostolate in the United States.
EWTN
The Eternal Word Television Network — Catholic media including TV, radio, and online resources.
Word on Fire
Bishop Robert Barron's evangelization ministry with articles, videos, and podcasts.
The Thomistic Institute
Formed by the Dominican Province of St. Joseph to promote Catholic truth in the public square.
Vatican News
The official news portal of the Holy See.
USCCB
The United States Conference of Catholic Bishops — statements, resources, and daily readings.
Understanding Our Citations
CCC 1324 — Catechism of the Catholic Church, paragraph 1324
John 6:51 — Gospel of John, chapter 6, verse 51
Canon 1247 — Code of Canon Law, Canon 1247
Lumen Gentium, 11 — Vatican II document, section 11
All citations can be verified using the links above. If you ever find a citation that appears inaccurate, please contact us at catholicknow@gmail.com.
CatholicKnow is a learning resource, not a replacement for the living teaching authority of the Church. For authoritative guidance on specific questions, consult your parish priest, bishop, or the documents cited above.