From the Emperor's Letter to Eusebius(in Eusebius' Life of Constantine, Book III. chap. 61).
"I have most carefully perused your letter, and perceive that you have strictly conformed to the rule enjoined by the discipline of the Church. Now to abide by that which appears at the same time pleasing to God, and accordant with apostolic tradition, is a proof of true piety: and you have reason to deem yourself happy on this behalf, that you are counted worthy, in the judgment, I may say, of all the world, to have the oversight of the whole Church. For the desire which all feel to claim you for their own, undoubtedly enhances your enviable fortune in this respect. Notwithstanding, your Prudence, whose resolve it is to observe the ordinances of God and the apostolic rule of the Church, has done excellently well in declining the bishopric of the Church at Antioch, and desiring to continue in that Church of which you first received the oversight by the will of God."
From Constantine's Letter to the Council (in Eusebius' Life of Constantine, Book III. chap. 62).
"I have perused the letters written by your Prudences, and highly approve of the wise resolution of your colleague in the ministry, Eusebius. Having, moreover, been informed of the circumstances of the case, partly by your letters, partly by those of our illustrious friends Acacius and Strategius, after sufficient investigation I have written to the people at Antioch, suggesting the course which will be at once pleasing to God and advantageous for the Church. A copy of this I have ordered to be subjoined to this present letter, in order that ye yourselves may know what I thought fit, as an advocate of the cause of justice, to write to that people: since I find in your letter this proposal, that, in consonance with the choice of the people, sanctioned by your own desire, Eusebius the holy bishop of Cæsarea should preside over and take the charge of the Church at Antioch. Now the letters of Eusebius himself on this subject appeared to be strictly accordant with the order prescribed by the Church."
From a Letter of Constantine to Eusebius (in Eusebius' Life of Constantine, Book IV. chap. 35).
"It is indeed an arduous task, and beyond the power of language itself, worthily to treat of the mysteries of Christ, and to explain in a fitting manner the controversy respecting the feast of Easter, its origin as well as its precious and toilsome accomplishment. For it is not in the power even of those who are able to apprehend them, adequately to describe the things of God. I am, notwithstanding, filled with admiration of your learning and zeal, and have not only myself read your work with pleasure, but have given directions, according to your own desire, that it be communicated to many sincere followers of our holy religion. Seeing, then, with what pleasure we receive favors of this kind from your Sagacity, be pleased to gladden us more frequently with those compositions, to the practice of which, indeed, you confess yourself to have been trained from an early period, so that I am urging a willing man (as they say), in exhorting you to your customary pursuits. And certainly the high and confident judgment we entertain is a proof that the person who has translated your writings into the Latin tongue is in no respect incompetent to the task, impossible though it be that such version should fully equal the excellence of the works themselves."
From a Letter of Constantine to Eusebius (in Eusebius' Life of Constantine, Book IV. chap. 36).
"It happens, through the favoring providence of God our Saviour, that great numbers have united themselves to the most holy Church in the city which is called by my name. It seems, therefore, highly requisite, since that city is rapidly advancing in prosperity in all other respects, that the number of Churches should also be increased. Do you, therefore, receive with all readiness my determination on this behalf. I have thought it expedient to instruct your Prudence to order fifty copies of the sacred scriptures (the provision and use of which you know to be most needful for the instruction of the Church) to be written on prepared parchment in a legible manner, and in a commodious and portable form, by transcribers thoroughly practiced in their art. The procurator of the diocese has also received instructions by letter from our Clemency to be careful to furnish all things necessary for the preparation of such copies; and it will be for you to take special care that they be completed with as little delay as possible. You have authority also, in virtue of this letter, to use two of the public carriages for their conveyance, by which arrangement the copies when fairly written will most easily be forwarded for my personal inspection; and one of the deacons of your Church may be intrusted with this service, who, on his arrival here, shall experience my liberality. God preserve you, beloved brother!"
From the Epistle of Eusebius of Nicomedia, to Paulinus, Bishop of Tyre (given by Theodoret in his Eccles. Hist. I. 6).
"Neither has the zeal of my lord Eusebius concerning the truth, nor thy silence in this matter been unknown, but has reached even us. And, as was fitting, on the one hand we have rejoiced on account of my lord Eusebius; but on the other, we are grieved on thy account, since we look upon the silence of such a man as a condemnation of our cause."
From the Book of Basil, to Amphilochius, on the Holy Spirit (chap. 29).
"If to any one Eusebius of Palestine seem trustworthy on account of his great experience, we give his own words in the Difficulties concerning the Polygamy of the Ancients."
From the Book of Questions on the Old and New Testaments, which is published among the Works of Augustine (chap. 125).
"We remember to have read in a certain pamphlet of Eusebius, a man formerly distinguished among the rest of men, that not even the Holy Spirit knows the mystery of the nativity of our Lord Jesus Christ; and I wonder that a man of so great learning should have imposed this stigma upon the Holy Spirit."
From Jerome's Epistle to Pammachius and Oceanus (Ep. 65).
"Apollinarius wrote the very strongest books against Porphyry; Eusebius has excellently composed his Ecclesiastical History. Of these men, one taught an incomplete human nature in Christ; the other was a most open defender of the heresy of Arius."
From the Apology of Jerome against Rufinus (Book I. chap. 8).
"As I have already said, Eusebius, bishop of Cæsarea, formerly leader of the Arian party, has written six books in defense of Origen--a very extensive and elaborate work; with much evidence he has proved that Origen was, from his point of view, a Catholic, that is, from ours, an Arian."
From the same book (chap. 9).
"For Eusebius himself, a friend, eulogist and companion of Pamphilus, has written three very elegant books comprising a life of Pamphilus. In these, after extolling other things with wondrous praises and exalting his humility to the skies, he also adds this in the third book," &c.
And a little farther on in the same book (chap. 11).
"I have praised Eusebius in his Ecclesiastical History, in his Chronological Canons, in his Description of the Holy Land; and turning these same little works into Latin I have given them to those of my own tongue. Am I therefore an Arian, because Eusebius who wrote these books is an Arian?"
From Jerome's second book against Rufinus (chap. 16).
"Eusebius, a very learned man (I have said learned, not Catholic; lest after the usual manner, even in this thing, thou heap calumny upon me), in six volumes does nothing else than show Origen to be of his own faith; that is, of the Arian heresy."
From the Preface of Jerome's Book on Hebrew Topography.
"Eusebius, who took his surname from the blessed martyr Pamphilus, after the ten books of his Ecclesiastical History, after his Chronological Canons, which we have published in the Latin tongue, after his Names of Various Nations, in which he showed how these were formerly, and are now, called among the Hebrews; after his Topography of the Land of Judea, with the inheritances of the tribes; after his Jerusalem, also, and his Plan of the Temple, with a very brief explanation,--after all these he has finally in this little work labored that he might collect for us from Holy Scripture the names of almost all the cities, mountains, rivers, villages, and divers places, which either remain the same, or have since been changed, or else have become corrupted from some source, wherefore we also, following the zeal of this admirable man," &c.
From Jerome's Book on Ecclesiastical Writers (chap. 61).
"Hippolytus, bishop of a certain church (I have not indeed been able to find out the name of the city), wrote a reckoning of Easter, and chronological tables up to the first year of the Emperor Alexander, and hit upon a cycle of sixteen years which the Greeks call hekkaidekaeterida; and gave an occasion to Eusebius, who also composed an Easter canon, with a cycle of nineteen years, that is enneadekaeterida."
From the same book (chap. 81).
"Eusebius, bishop of Cæsarea in Palestine, a man most studious in the sacred Scriptures, and along with Pamphilus the martyr a most diligent investigator of sacred literature, has edited an infinite number of volumes, some of which are these: of the Demonstratio Evangelica, twenty books; of the Præparatio Evangelica, fifteen books; of the Theophania, five books; of the Ecclesiastical History, ten books; a General History in Chronological Tables, and an Epitome of them; also, On the Discrepancies of the Gospels; On Isaiah, ten books; and Against Porphyry (who at the same time was writing in Sicily, as some think), thirty books, of which only twenty have come to my notice; of his Topica, one book; of the Apologia, in defense of Origen, six books; On the Life of Pamphilus, three books; Concerning the Martyrs, other small works; also very learned commentaries on the hundred and fifty Psalms, and many other writings. He flourished chiefly under the emperors Constantine and Constantius; and on account of his friendship with Pamphilus the martyr, he took from him his surname."
From the same book (chap. 96).
"Eusebius, by nation a Sardinian, and, after being reader in Rome, bishop of Vercellæ, on account of his confession of the faith banished by the Prince Constantius to Scythopolis, and thence to Cappadocia, under Julian the emperor sent back to the Church, has published the Commentaries on the Psalms of Eusebius of Cæsarea, which he had translated from Greek into Latin."
Jerome in the Preface to his Commentaries on Daniel.
"Against the prophet Daniel Porphyry wrote a twelfth volume, denying that that book was composed by him with whose name it is inscribed, &c. To him Eusebius, bishop of Cæsarea, has replied very skillfully in three volumes, that is, in volumes XVIII., XIX., and XX. Apollinarius also in one large volume, that is, in the twenty-sixth volume, and before these, in part, Methodius."
Jerome on the Twenty-fourth Chapter of Matthew.
"Concerning this place, that is, concerning the abomination of desolation which was spoken of by the prophet Daniel, standing in the holy place, Porphyry has uttered many blasphemies against us in the thirteenth volume of his work. To whom Eusebius, bishop of Cæsarea, has replied in three volumes, that is, in volumes XVIII., XIX., and XX."
The same, in his Epistle to Magnus (Ep. 84).
"Celsus and Porphyry have written against us. To the former Origen, to the latter Methodius, Eusebius, and Apollinarius have very vigorously replied. Of whom Origen wrote eight books, Methodius proceeded as far as ten thousand lines, Eusebius and Apollinarius composed twenty-five and thirty volumes respectively."
The same, in his Epistle to Pammachius and Oceanus (Ep. 65).
"What more skillful, more learned, more eloquent men can be found than Eusebius and Didymus, the advocates of Origen? The former of whom, in the six volumes of his Apologia, proves that he [Origen] was of the same opinion as himself."
Jerome, in the Preface to his Commentaries on Isaiah.
"Eusebius Pamphili also has published an historical commentary in fifteen volumes."
The same, in the Preface to the Fifth Book of his Commentaries on Isaiah.
"Shall I take upon myself a work at which the most learned men have labored hard? I speak of Origen and Eusebius Pamphili. Of these the former wanders afar in the free spaces of allegory, and his genius so interprets single names as to make out of them the sacred things of the Church. The latter, while promising in his title an historical exposition, meanwhile forgets his purpose, and yields himself up to the tenets of Origen."
The same, in the fifth book of his Commentaries on Isaiah.
"Eusebius of Cæsarea, while promising in his title an historical exposition, strays off in divers notions: while reading his books I found much else than what he gave promise of in his title. For wherever history has failed him, he has crossed over into allegory; and in such a manner does he unite things that are distinct, that I wonder at his joining together by a new art of discourse stone and iron into one body."