<p>The most weighty of the doctrinal treatises is that on the Holy Trinity. The Latin original (De Trinitate contra Arianos libri quindecim), is contained in the 8th volume of the Benedictine edition. It is the most elaborate, and probably also the ablest and profoundest patristic discussion of this central doctrine of the Christian religion, unless we except the Orations against the Arians, by Athanasius, "the Father of Orthodoxy," who devoted h...