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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.2 articles Who Is Jesus Christ?The Incarnation, the hypostatic union, the redemption.2 articles Sacred ScriptureThe canon, inerrancy, senses of Scripture, interpretation.2 articles Sacred TraditionThe deposit of faith, development of doctrine, the Fathers.2 articles The Church & Apostolic AuthorityEcclesiology, the papacy, apostolic succession, the magisterium.2 articles The SacramentsThe seven sacraments — sign, matter, form, minister, effect.4 articles The Blessed Virgin MaryThe Marian dogmas and the Church's devotion to the Mother of God.2 articles The SaintsCanonisation, intercession, relics, patronage.2 articles The Moral LifeVirtue, sin, conscience, the commandments, the beatitudes.4 articles Bioethics & Human DignityLife, death, sexuality, medicine — the body as a locus of moral truth.2 articles The Last ThingsDeath, judgment, heaven, hell, purgatory — eschatology.2 articles Prayer & the Spiritual LifeLiturgy, contemplation, the interior life.2 articles Answering HeresiesHeresies named and refuted — Arian, Pelagian, Gnostic, Modernist.forthcoming Answering Protestant ClaimsSola scriptura, sola fide, the papacy, Mary, the saints — sourced replies.forthcoming 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.1 article Answering the WMSCOGThe World Mission Society Church of God, Ahn Sahng-hong, Heavenly Mother — examined.2 articles 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.forthcoming Philosophy & Classical FormationAct and potency, the four causes, substance and accident, the transcendentals.10 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.

Who Is God?

Divine Simplicity: Why God Is Not Composed of Parts

A primary-source-anchored treatment for the LumenVeritatis pillar of Who Is God?.

1,324 words · 6-minute read

The Holy Trinity: One God in Three Persons — A Primary-Source Walkthrough

A primary-source-anchored treatment for the LumenVeritatis pillar of Who Is God?.

1,555 words · 7-minute read

Who Is Jesus Christ?

Christ's Two Wills: How Constantinople III Closed the Christological Question

A primary-source-anchored treatment for the LumenVeritatis pillar of Who Is Jesus Christ?.

1,103 words · 5-minute read

The Hypostatic Union: How One Person Is Both God and Man

A primary-source-anchored treatment for the LumenVeritatis pillar of Who Is Jesus Christ?.

1,506 words · 7-minute read

Sacred Scripture

The Four Senses of Scripture: How the Catholic Tradition Reads the Bible

A primary-source-anchored treatment for the LumenVeritatis pillar of Sacred Scripture.

1,445 words · 7-minute read

The Catholic Canon of Scripture: Why 73 Books, and Who Decided

A primary-source-anchored treatment for the LumenVeritatis pillar of Sacred Scripture.

1,550 words · 7-minute read

Sacred Tradition

Development of Doctrine: How Doctrine Grows Without Changing

A primary-source-anchored treatment for the LumenVeritatis pillar of Sacred Tradition.

1,668 words · 8-minute read

Scripture and Tradition: One Deposit, Two Modes — What Dei Verbum Teaches

A primary-source-anchored treatment for the LumenVeritatis pillar of Sacred Tradition.

1,529 words · 7-minute read

The Church & Apostolic Authority

Apostolic Succession: The Unbroken Chain from the Apostles

A primary-source-anchored treatment for the LumenVeritatis pillar of The Church & Apostolic Authority.

1,566 words · 7-minute read

Papal Primacy from the Fathers: The Pre-Schism Witness

A primary-source-anchored treatment for the LumenVeritatis pillar of The Church & Apostolic Authority.

1,657 words · 8-minute read

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

Lanciano: The 8th-Century Eucharistic Miracle and the 1971 Forensic Study

A primary-source-anchored treatment for the LumenVeritatis pillar of The Sacraments.

1,458 words · 7-minute read

The Seven Sacraments: A Walkthrough of Each in the Catholic Tradition

A primary-source-anchored treatment for the LumenVeritatis pillar of The Sacraments.

1,780 words · 8-minute read

The Blessed Virgin Mary

The Immaculate Conception: What 1854 Defined and Why

A primary-source-anchored treatment for the LumenVeritatis pillar of The Blessed Virgin Mary.

1,616 words · 7-minute read

Theotokos: How the Council of Ephesus Defined Mary as Mother of God

A primary-source-anchored treatment for the LumenVeritatis pillar of The Blessed Virgin Mary.

1,566 words · 7-minute read

The Saints

Carlo Acutis: The Millennial Saint Who Loved the Eucharist

A primary-source-anchored treatment for the LumenVeritatis pillar of The Saints.

1,607 words · 7-minute read

Pier Giorgio Frassati: The Saint of the Beatitudes Who Climbed Mountains

A primary-source-anchored treatment for the LumenVeritatis pillar of The Saints.

1,583 words · 7-minute read

The Moral Life

Is Contraception a Mortal Sin? The Magisterium Examined

A primary-source-anchored treatment for the LumenVeritatis pillar of The Moral Life.

1,638 words · 7-minute read

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 Sin vs. Venial Sin: The Catholic Distinction

A primary-source-anchored treatment for the LumenVeritatis pillar of The Moral Life.

1,507 words · 7-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

Bioethics & Human Dignity

Physician-Assisted Suicide and Euthanasia: The Catholic Teaching

A primary-source-anchored treatment for the LumenVeritatis pillar of Bioethics & Human Dignity.

1,725 words · 8-minute read

IVF and the Discarded Embryo: The Magisterium's Whole Teaching

A primary-source-anchored treatment for the LumenVeritatis pillar of Bioethics & Human Dignity.

1,728 words · 8-minute read

The Last Things

Hope for Unbaptized Infants: What the ITC Document of 2007 Actually Says

A primary-source-anchored treatment for the LumenVeritatis pillar of The Last Things.

1,529 words · 7-minute read

Purgatory: The Doctrine from Scripture and the Fathers

A primary-source-anchored treatment for the LumenVeritatis pillar of The Last Things.

1,848 words · 8-minute read

Prayer & the Spiritual Life

Lectio Divina: The Four Steps of Praying with Scripture

A primary-source-anchored treatment for the LumenVeritatis pillar of Prayer & the Spiritual Life.

1,652 words · 8-minute read

The Three Ways: Purgative, Illuminative, Unitive — A Map of the Spiritual Life

A primary-source-anchored treatment for the LumenVeritatis pillar of Prayer & the Spiritual Life.

1,707 words · 8-minute read

Answering Jehovah's Witnesses

1914 and the "This Generation" Prophecy: The Watchtower Claim Tested

A primary-source-anchored treatment for the LumenVeritatis pillar of Answering Jehovah's Witnesses. The Watchtower case for 1914 is steel-manned in its own published voice before the Catholic test is applied.

4,210 words · 18-minute read

Answering the WMSCOG

Ahn Sahng-hong as Christ's Second Coming: The Claim Tested

A primary-source-anchored treatment for the LumenVeritatis pillar of Answering the WMSCOG. Ahn is steel-manned in his own words before the Catholic test is applied; five trained-WMSCOG-member counter-moves are answered.

6,800 words · 28-minute read

Zahng Gil-jah as God the Mother: The Claim Tested

Companion article to "Ahn Sahng-hong as Christ's Second Coming." A primary-source-anchored treatment for the LumenVeritatis pillar of Answering the WMSCOG. Zahng-as-Mother is steel-manned in WMSCOG's own published voice — including its Genesis 1:26-27 "Elohim is plural" argument, its Galatians 4:26 "Heavenly Jerusalem is our mother" reading, and its natural-theology backing — before the Catholic test is applied. Includes the load-bearing internal contradiction: Ahn Sahng-hong himself, in 1978, refuted the divine-mother claim WMSCOG now teaches.

5,400 words · 23-minute read

Philosophy & Classical Formation

Act and Potency: The Foundation of Catholic Metaphysics

A primary-source-anchored treatment for the LumenVeritatis pillar of Philosophy & Classical Formation.

1,639 words · 7-minute read

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 Four Causes: Aristotle, Aquinas, and Why They Still Matter

A primary-source-anchored treatment for the LumenVeritatis pillar of Philosophy & Classical Formation.

1,643 words · 7-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

apologetics

Is the Mass a Re-Sacrifice of Christ? — What Calvin Argued, and What the Sources Say

A primary-source-anchored treatment for the LumenVeritatis pillar of apologetics.

2,459 words · 11-minute read

magisterial

The Real Presence: What Scripture, the Fathers, the Catholic Magisterium, and the Reformers Said

A primary-source-anchored treatment for the LumenVeritatis pillar of magisterial.

8,336 words · 38-minute read

saints

St. Anicetus, Pope, Martyr

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

932 words · 4-minute read

St. Galdini

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

215 words · 1-minute read

St. Leo Ix. Pope, C

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

1,335 words · 6-minute read

St. Agnes Of Monte Pulciano,

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

582 words · 3-minute read

St. Anselm, C

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

1,560 words · 7-minute read

St. Caius, Pope

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

468 words · 2-minute read

St. George

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

225 words · 1-minute read

St. Fidelis, Of Sigmarengen, M

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

1,484 words · 7-minute read

St. Mark, Evangelist

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

1,167 words · 5-minute read

St. Marcellinus, Pope, M.+

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

760 words · 3-minute read

St. Anthimus, Bishop,

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

674 words · 3-minute read

St. Vitalis, Martyr

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

905 words · 4-minute read

St. Peter, Martyr

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

1,305 words · 6-minute read

St. Catharine Of Sienna, Virgin,

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

1,798 words · 8-minute read

St. Philip, Apostle

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

868 words · 4-minute read

St. Athanasius,

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

846 words · 4-minute read

St. Alexander, Pope,

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

700 words · 3-minute read

St. Monica, Y/Idow

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

786 words · 4-minute read

St. Pius V. Pope, C

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

452 words · 2-minute read

St. John Before The Latin Gate

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

761 words · 3-minute read

St. Stanislas, Bishop Of Cracow,

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

502 words · 2-minute read

St. Peteb, B,

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

655 words · 3-minute read

St. Gregory Nazianzen, B. C

A primary-source-anchored treatment for the LumenVeritatis pillar of saints.

1,658 words · 8-minute read