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LumenVeritatis veritas lucet

veritas lucet · the truth shines

A Catholic reference, re-cited to the primary sources.

Every claim traceable. Every citation opens to its original-language source. Read the full mission →

Under the patronage of Bl. Carlo Acutis.

Where to begin

Every article lives under one of these. Click a tile to see everything in it — or browse the full A–Z.

Who Is God?The Holy Trinity, the divine attributes, the Father.forthcoming Who Is Jesus Christ?The Incarnation, the hypostatic union, the redemption.forthcoming Sacred ScriptureThe canon, inerrancy, senses of Scripture, interpretation.forthcoming Sacred TraditionThe deposit of faith, development of doctrine, the Fathers.forthcoming The Church & Apostolic AuthorityEcclesiology, the papacy, apostolic succession, the magisterium.forthcoming The SacramentsThe seven sacraments — sign, matter, form, minister, effect.2 articles The Blessed Virgin MaryThe Marian dogmas and the Church's devotion to the Mother of God.forthcoming The SaintsCanonisation, intercession, relics, patronage.forthcoming The Moral LifeVirtue, sin, conscience, the commandments, the beatitudes.2 articles Bioethics & Human DignityLife, death, sexuality, medicine — the body as a locus of moral truth.forthcoming The Last ThingsDeath, judgment, heaven, hell, purgatory — eschatology.forthcoming Prayer & the Spiritual LifeLiturgy, contemplation, the interior life.forthcoming Answering HeresiesHeresies named and refuted — Arian, Pelagian, Gnostic, Modernist.forthcoming Answering Protestant ClaimsSola scriptura, sola fide, the papacy, Mary, the saints — sourced replies.1 article Answering IslamThe Qur'an's own claims, ḥadīth sources, and the Christian response.forthcoming Answering MormonismThe LDS scriptures, the First Vision, the Restoration claim — examined.forthcoming Answering Jehovah's WitnessesThe New World Translation, Arian Christology, the 1914 kingdom — examined.forthcoming Answering the WMSCOGThe World Mission Society Church of God, Ahn Sahng-hong, Heavenly Mother — examined.forthcoming Answering Eastern ReligionsHinduism, Buddhism, the schools of the East — engaged from the primary sources.forthcoming Answering the Secular WorldAtheism, scientism, relativism — philosophy and the primary sources.1 article Philosophy & Classical FormationAct and potency, the four causes, substance and accident, the transcendentals.8 articles A–Z IndexEvery article, listed by title.every article, by title

Newly added

A reader, a book, a tradition

St. Jerome at his desk, surrounded by his books
St. Jerome at his desk — a scholar with his sources. The pattern of this site.
Illuminated page from the Book of Kells, c. 800
The Book of Kells, c. 800. Tradition handed on, line by line.
Vermeer — Woman Reading a Letter, c. 1663
Vermeer's reader, c. 1663. A page, carefully read — the reader this site is for.

The catalogue

All articles, grouped by pillar. Click any title to read; click any bracketed citation inside to open its primary source.

The Sacraments

Can I Receive Communion If…? — A Decision Tree from the Church's Own Law

The conditions of worthy reception, reported from Scripture, the Council of Trent, the Code of Canon Law, the Catechism, the Didache, Ignatius of Antioch, Justin Martyr, and John Chrysostom

3,400 words · 16-minute read

How to Go to Confession — Step by Step, Grounded in the Church's Own Texts

A reader-at-the-door reference — what the sacrament is, what is required for validity, and the procedure from examination through satisfaction, sourced to CCC, CIC, and Trent

3,500 words · 17-minute read

The Moral Life

Is Missing Mass on Sunday a Mortal Sin? — What the Church Actually Teaches

The precept, the excusing causes, and the three conditions — reported from the Code of Canon Law, the Catechism, Aquinas, the Didache, Justin Martyr, and the Council of Trent

3,000 words · 14-minute read

Mortal vs Venial Sin — What the Church Actually Teaches

The three conditions, the conciliar definition, and the biblical and patristic warrant, reported from primary sources

3,300 words · 15-minute read

Answering Protestant Claims

Why Catholics Go to a Priest for Confession — What the Sources Say

The Reformed objection, the biblical institution, the continuous patristic practice, and the conciliar dogma — reported from primary sources in the order the Protestant reader's trust priors require

4,500 words · 22-minute read

Answering the Secular World

Is the Big Bang Compatible with Catholicism? — The Theory a Catholic Priest Proposed, and Three Popes Welcomed

Fr. Georges Lemaître, Pope Pius XII's 1951 address to the Pontifical Academy of Sciences, John Paul II on truth and truth, the Catechism on creation ex nihilo — and what the "Big Bang disproves God" objection actually claims

3,500 words · 17-minute read

Philosophy & Classical Formation

The Four Causes

Material, formal, efficient, final — the metaphysical grammar Catholic thought inherits from Aristotle and receives through Aquinas

3,500 words · 16-minute read

Potency and Act

On dunamis and energeia, actus and potentia — the distinction the First Way depends on, reported from Aristotle and Aquinas

3,000 words · 13-minute read

The Socratic Method

Elenchus, aporia, disputatio — how the classical tradition teaches by questioning, and how the Christian Doctors received and grounded the method

3,700 words · 17-minute read

Substance and Accident

What the Church means by these words — and why the distinction is the grammar of the Creeds, the Incarnation, and the Real Presence

3,700 words · 17-minute read

The Transcendentals

What the One, the True, the Good, and the Beautiful are, and why they are one thing seen from four sides

2,400 words · 12-minute read

What is Beauty?

On pulchrum — the classical definition, the three conditions, and why the Church calls beauty the radiance of the first three transcendentals

2,700 words · 12-minute read

What is the Good?

From Aristotle's ergon argument to the rich young man — what every appetite in every creature is, finally, seeking

2,900 words · 14-minute read

What is Truth?

Pilate's question, the classical answer, and the Person who calls Himself the Truth

2,600 words · 13-minute read