and to co-operate in the work of salvation with the will of God. Though possessed neither of Basil's gift of government nor of Gregory of Nyssa's power of speculative thought, he worthily takes a place in that triumvirate of Cappadocians whom the Catholic Church gratefully recognizes as having been, during the critical struggles in the latter half of the 4th century, the best defenders of its faith. The _Opera omnia_ were first published by Hervagius (Basel, 1550); the subsequent editions have been those of Billius (Paris, 1609, 1611; aucta ex interpretatione Morelli, 1630), of the Benedictines (begun in 1778, but interrupted by the French Revolution and not completed until 1840, Caillau being the final editor) and of Migne. The _Theological Orations_ (edited by A. J. Mason) were published separately at Cambridge in 1899. Scattered notices of the life of Gregory Nazianzen are to be found in the writings of Socrates, Sozomen, Theodoret and Rufinus, as well as in his own letters and poems. The data derived from these sources do not always harmonize with the account of Suidas. The earlier modern authorities, such as Tillemont (_Mem. Eccl._ t. ix.) and Leclerc (_Bib. Univ._ t. xviii.), were used by Gibbon. See also C. Ullmann, _Gregorius von Nazianz, der Theologe_ (1825; Eng. trans. by G. F. Coxe, M.A., 1857); A. Benoit, _St Gregoire de Nazianze; sa vie, ses oeuvres, et son epoque_ (1877); Montaut, _Revue critique de quelques questions historiques se rapportant a St Gregoire de Nazianze_ (1879); F. W. Farrar, _Lives of the Fathers_, i. 491-582, and F. Loofs in Hauck-Herzog's _Realencyk. fur prot. Theologie_, vii. 138.