Tom's Learning Notes

On the Trinity (Latin: De Trinitate) is a theological work by St Augustine, written in the early 5th century CE. In offering a philosophical defence of the Christian doctrine of the trinity, Augustine makes a number of arguments whose significance goes beyond their apologetic purpose. His arguments against skepticism in this and other works have often been seen as a precursor to those of Descartes.

The most common public domain translation is that of Arthur West Haddan for the Select Library of the Nice and Post-Nicene Fathers.

On the Trinity at Amazon

Free online texts

English transations

Christian Classics Ethereal Library: On the Holy Trinity; Doctrinal Treatises; Moral Treatises. On the Trinity translated by Arthur West Haddan. Multiple formats.

Internet Archive: On The Trinity, translated by Arthur West Haddan. EPUB, MOBI, PDF, TXT formats.

Internet Archive: On the Holy Trinity; Doctrinal Treatises; Moral Treatises. Select Library of the Nice and Post-Nicene Fathers, translated by Arthur West Haddan. EPUB, MOBI, PDF, TXT formats.

Logos Virtual Library: On The Trinity, translated by Arthur West Haddan. HTML and other formats.

New Advent: On the Trinity, translated by Arthur West Haddan, revised by Kevin Knight. HTML format.

Sacred Texts: On the Holy Trinity; Doctrinal Treatises; Moral Treatises, translated by Arthur West Haddan. HTML format.

Tertullian.org: On the Holy Trinity; Doctrinal Treatises; Moral Treatises, translated by Arthur West Haddan. HTML format.

Wikisource: On the Holy Trinity, English translation by Arthur West Haddan. HTML and other formats.

Latin texts

Latin Library: Augustine of Hippo, De Trinitate and other Latin texts. HTML format.

Wikisource: De Trinitate (Aurelius Augustinus), Latin text. HTML and other formats.