Authoritative Sources
Below are the authoritative sources of Catholic Truth. As much as possible, the content on this website follows these sources. Links earn commission from Amazon for the Apostolate.
Prayer
St. Thomas On Prayer
St. Alphonsus: The Basics of Prayer
(Introduction to the Nine Levels of Prayer)
St. Francis de Sales: Introduction to Mental Prayer
Meditations from the saints
Manual of Prayers Online or Print
The Raccolta
Blessed Be God
The Roman Breviary
The Monastic Diurnal
The Divine Office Online
Liturgy of the Hours
Spiritual Classics
The Institutes Online or Print
The Conferences Online or Print
The Ladder of Divine Ascent Online or Print
Imitation of Christ Online or Print
Introduction to the Devout Life Online or Print
The Spiritual Combat Online or Print
The Secret of the Rosary Online or Print
True Devotion to Mary Online or Print
Sacred Scripture
Greek and Latin with Knox interlinear
Vulgate-Douay Rheims-Knox interlinear
On the Holy Gospels (Catena Aurea) Online or Print
The Great Commentary of Lapide on Holy Scripture
Neale’s Commentary on the Psalms Vol I: Ps. 1-38 Note: Hebrew Numbering
Neale’s Commentary on the Psalms Vol II: Ps. 39-80
Neale’s Commentary on the Psalms Vol III: Ps. 81-118
Neale’s Commentary on the Psalms Vol IV: Ps. 119-150
The Holy Fathers
Miscellaneous
Summary of Catholic Doctrine with links to the Summa
List and definition of all virtues from Thomist Philosopher Fr. Ripperger
Glossary of Philosophical Terms
Free iPieta App– excellent mobile app with numerous Authoritative sources
Doctrine[1]
Denzinger Print
Ott Print
Roman Catechism Online or PDF or Print
Baltimore Catechism 4 Online or Print
Catechism of Pius X Online or Print
The New Catechism[2]
Moral Theology
Prummer Online or Digitized (full index, incomplete text), Digitized (full text, no index) or Print
St. Alphonsus Vol. I
St. Alphonsus Vol. II
St. Thomas
Summa Online or Print
Pegues’ Catechism of Summa Online or Digitized or Print
Aquinas English works
St. Alphonsus
Sermons for every Sunday of the Year
Preparation for Death online or print
Selected works Online
Non-Authoritative but Recommended Resources
The Current Crisis
Iota Unum: A Study of Changes in the Catholic Church in the 20th Century by Romano Amerio – this classic text is a must read.
Trojan Horse in the City of God: The Crisis Explained by Dietrich von Hildebrand – another classic written in 1967 by one of the great men of the 20th century.
The Devastated Vineyard by Dietrich von Hildebrand online or print – the Doctor of the 20th Century asserts in 1973 that enemies have infiltrated the Church
The Charitable Anathema by Dietrich von Hildebrand – a collection of essays on the crisis before his death in 1977.
Infiltration
Topics on Tradition
Magisterial Authority
The Binding Force of Tradition
Catholic Politics
The Framework of a Christian State Online or Print
Popes Against Modern Errors
Liberty: The God That Failed
Catholic Republic
The Greek Schism
Russia and the Universal Church – Vladimir Soloviev’s seminal work unmasking the Greek schism Online or Print
The Early Papacy: To the Synod of Chalcedon in 451
Modern classics
Humility Of Heart
The Ways of Mental Prayer
The Soul of The Apostolate
The Three Ages of the Interior Life
Spiritual Theology
Websites
Fisheaters
Sensustraditionis
Newadvent
Whispers of Restoration
Catechism Class
[1]I have researched the copyright law regarding these works published before 1978 and reprinted by various publishers. Many of them have been obtained via archive.org. It appears that these works are in the public domain, but if I have made an error in this please contact me.
[2] The New Catechism of St. John Paul II is not authoritative in every statement because it includes instances of Sententia Communis and Probabilis without making such distinctions. Thus a new reader would not be able to use this as completely authoritative. An example is the inclusion of the teaching that Muhammadans and Christians worship the same God and the prudential condemnation of the death penalty. Both of these matters are under dispute and are not part of the faith (the Holy Office explicitly declared, for example, that faithful Catholics are permitted to disagree with the Pope on the death penalty in 2004). It is recommended that the reader first read the older catechisms in order to properly benefit from the new.