With the exception of atheistic philosophy, which was not worth the risk, Origen encouraged his scholars to study everything; and he gave them a regular course of dialectics, physics, and moral philosophy, as a preparation for theology. Augustine, who ascribes his first conversion from a vicious life to the _Hortensius_ of Cicero (_Conf., III._ iv. I), was not likely to take an extreme line in condemning classical literature, from which he himself frequently quotes. Of Cicero's _Hortensius_ he says, "This book in truth changed my affections, and turned my prayers to Thyself, O Lord, and made me have other hopes and desires." He quotes, among other classical authors, not only Virgil, Livy, Lucan, Sallust, Horace, Pliny and Quintillian, but Terence, Persius, and Juvenal, and of the last from those Satires which are sometimes omitted by editors on account of their grossness. In his treatise _On Christian Doctrine_ (_II._ xl.), he contends that we must not shrink from making use of all that is good and true in heathen writings and institutions. We must "spoil the Egyptians." The writings of his instructor Ambrose show that he also was well acquainted with the best Latin classics. In Jerome we have what may be called an essay on the subject. Ruffinus had suggested to Magnus, a Roman rhetorician, that he should ask Jerome why he filled his writings with so many allusions and quotations taken from pagan literature, and Jerome in reply, after quoting the opening verses of the Book of Proverbs, refers him to the example of St. Paul in the Epistles to Titus and the Corinthians, and in the speech in the Acts. Then he points to Cyprian, Origen, Eusebius, and Apollinaris: "read them, and you will find that in comparison with them we have little skill (in quotation)." Besides these he appeals to the examples, among Greek writers, of Quadratus, Justin Martyr, Dionysius, Clement of Alexandria, Basil, Gregory Nazianzen, etc.; and among Latins, Tertullian, Minucius Felix, Arnobius, Hilary, and Juvencus. And he points out that quotations from profane authors occur in nearly all the works of these writers, and not merely in those which are addressed to heathen. But while Jerome defends the study of classical authors as a necessary part of education, he severely condemns those clergy who amused themselves with such writers as Plautus (of whom he himself had been very fond), Terence, and Catullus, when they ought to have been studying the Scriptures. Later in life his views appear to have become more rigid; and we find him rejoicing that the works of Plato and Aristotle are becoming neglected.
It was the short reign of Julian, commonly called "the Apostate" (A.D. 361-363), which had brought the question very much to the front. His policy and legislation probably influenced Augustine and Jerome in taking a more liberal line in the matter, in spite of Latin dislike of Greek philosophy and their own ascetic tendencies. Julian, jealous of the growing influence of Christian teachers, tried to prevent them from lecturing on classical authors. From this he hoped to gain two advantages. (1) Secular education would to a large extent be taken out of Christian hands. (2) The Christian teachers themselves would become less well educated, and less able to contend with heathen controversialists. He sarcastically pointed out the inconvenience of a teacher expounding Homer and denouncing Homer's gods: Christians had better confine themselves to "expounding Matthew and Luke in the Churches of the Galileans," and leave the interpretation of the masterpieces of antiquity to others. And he seems not to have contented himself with cynical advice, but to have passed a law that no Christian was to teach in the public schools. This law was at once cancelled by his successor Valentinian; but it provoked a strong feeling of resentment, and stirred up Christians to recognize and hold fast the advantages of a classical education.
But while the influence of the first three of the four great Latin Fathers was in favour of a wise use of the products of pagan genius, the influence of the last of the four was disastrously in the opposite direction.