7. The heretics, too, boast of the unity of their Churches, but St. Augustin says that it is unity against unity. "What unity,"

says the Saint, "can all those Churches have which are divided from the Catholic Church, which is the only true one; they are but as so many useless branches cut off from the Vine, the Catholic Church, which is always firmly rooted. This is the One Holy, True, and Catholic Church, opposing all heresies; it may be opposed, but cannot be conquered. All heresies come forth from it, like useless shoots cut off from the vine, but it still remains firmly rooted in charity, and the gates of hell shall not prevail against it" (St. Aug. lib. 1, de Symbol. ad Cath. c. 6). St. Jerome says that the very fact of the heretics forming a church apart from the Roman Church is a proof, of itself, that they are followers of error, and disciples of the devil, described by the Apostle as "giving heed to spirits of error and doctrines of devils" (1 Tim. iv. 1).

8. The Lutherans and Calvinists say, just as the Donatists did before them, that the Catholic Church preserved the true faith down to a certain period-some say to the third, some to the fourth, some to the fifth century-but that after that the true doctrine was corrupted, and the spouse of Christ became an adulteress. This supposition, however, refutes itself; for, granting that the Roman Catholic Church was the Church first founded by Christ, it could never fail, for our Saviour himself promised that the gates of hell never should prevail against it: "I say unto you that you are Peter, and on this rock I will build my Church, and the gates of hell shall not prevail against it" (Matt. xviii. 18). It being certain, then, that the Roman Catholic Church was the true one, as Gerard, one of the first ministers of Luther, admits (Gerard de Eccles. cap. 11, sec. 6) it to have been for the first five hundred years, and to have preserved the Apostolic doctrine during that period, it follows that it must always have remained so, for the spouse of Christ, as St. Cyprian says, could never become an adulteress.

9. The heretics, however, who, instead of learning from the Church the dogmas they should believe, wish to teach her false and perverse dogmas of their own, say that they have the Scriptures on their side, which are the fountain of truth, not considering, as a learned author (3) justly remarks, that it is not by reading, but by understanding, them, that the truth can be found. Heretics of every sort avail themselves of the Scriptures to prove their errors, but we should not interpret the Scripture according to our own private opinions, which frequently lead us astray, but according to the teaching of the Holy Church which is appointed the Mistress of true doctrine, and to whom God has manifested the true sense of the Divine books. This is the Church, as the Apostle tells us, which has been appointed the pillar and the ground of truth: "that thou mayest know how thou oughtest to behave thyself in the house of God, which is the Church of the living God, the pillar and the ground of truth.” (1 Tim. iii. 15.) Hence St. Leo says, that the Catholic faith despises the errors of heretics barking against the Church, who, deceived by the vanity of worldly wisdom, have departed from the truth of the Gospel.-(St. Leo. Ser. 8 de Nat. Dim.)

10. I think the History of Heresies is a most useful study, for it shows the truth of our Faith more pure and resplendent, by showing how it has never changed; and if, at all times, this is useful, it must be particularly so at present, when the most holy maxims and the principal dogmas of religion are put in doubt: it shows, besides, the care God always took to sustain the Church in the midst of the tempests which were unceasingly raised against it, and the admirable manner in which all the enemies who attacked it were confounded. The History of Heresies is also useful to preserve in us the spirit of humility and subjection to the Church, and to make us grateful to God for giving us the

(3) Danes, Gen. Temp. Nat. in Epil.

grace of being born in Christian countries; and it shows how the most learned men have fallen into the most grievous errors, by not subjecting themselves to the Church's teaching.

11. I will now state my reasons for writing this Work; some may think this labour of mine superfluous, especially as so many learned authors have written expressly and extensively the history of various heresies, as Tertullian, St. Iræneus, St. Epiphanius, St. Augustin, St. Vincent of Lerins, Socrates, Sozymen, St Philastrius, Theodoret, Nicephorus, and many others, both in ancient and modern times. This, however, is the very reason which prompted me to write this Work; for as so many authors have written, and so extensively, and as it is impossible for many persons either to procure so many and such expensive works, or to find time to read them, if they had them, I, therefore, judged it better to collect in a small compass the commencement and the progress of all heresies, so that in a little time, and at little expense, any one may have a sufficient knowledge of the heresies and schisms which infected the Church. I have said in a small compass, but still, not with such brevity as some others have done, who barely give an outline of the facts, and leave the reader dissatisfied, and ignorant of many of the most important circumstances. I, therefore, have studied brevity; but I wish, at the same time, that my readers may be fully informed of every notable fact connected with the rise and progress of, at all events, the principal heresies that disturbed the Church.

12. Another reason I had for publishing this Work was, that as modern authors, who have paid most attention to historical facts, have spoken of heresies only as a component part of Ecclesiastical History, as Baronius, Fleury, Noel Alexander, Tillemont, Orsi, Spondanus, Raynaldus, Graveson, and others, and so have spoken of each heresy chronologically, either in its beginning, progress, or decay, and, therefore, the reader must turn over to different parts of the works to find out the rise, progress, and dis

appearance of each heresy; I, on the contrary, give all at once the facts connected with each heresy in particular.

13. Besides, these writers have not given the Refutation of Heresies, and I give this in the second part of the Work; I do not mean the refutation of every heresy, but only of the principal ones, as these of Sabellius, Arius, Pelagius, Macedonius, Nestorius, Eutyches, the Monothelites, the Iconoclasts, the Greeks, and the like. I will merely speak of the authors of other heresies of less note, and their falsity will be apparent, either from their evident weakness, or from the proofs I bring forward against the more celebrated heresies I have mentioned.

14. We ought, then, dear reader, unceasingly to thank our Lord for giving us the grace of being born and brought up in the bosom of the Catholic Church. St. Francis de Sales exclaims: "O good God! many and great are the benefits thou hast heaped on me, and I thank thee for them; but how shall I be ever able to thank thee for enlightening me with thy holy Faith?" And writing to one of his friends, he says: "O God! the beauty of thy holy Faith appears to me so enchanting, that I am dying with love of it, and I imagine I ought to enshrine this precious gift in a heart all perfumed with devotion." St. Teresa never ceased to thank God for having made her a daughter of the Holy Church: her consolation at the hour of death was to cry out: "I die a child of the Holy Church-I die a child of the Holy Church." We, likewise, should never cease praising Jesus Christ for this grace bestowed on us-one of the greatest conferred on us-one distinguishing us from so many millions of mankind, who are born and die among infidels and heretics: "He has not done in like manner to every nation" (Psalm, cxlvii. 9). With our minds filled with gratitude for so great a favour, we shall now see the triumph the Church has obtained through so many ages, over so many heresies opposed to her. I wish to remark, however, before I begin, that I have written this Work amidst

the cares of my Bishoprick, so that I could not give a critical. examination, many times, to the facts I state, and, in such case, I give the various opinions of different authors, without deciding myself on one side or the other. I have endeavoured, however, to collect all that could be found in the most correct and notable writers on the subject; but it is not impossible that some learned persons may be better acquainted with some facts than I am.