In the middle of the third century there were in sharp conflict two distinct and opposed theories of Church unity: the theory that the unity was based upon adherence to and conformity with the see of Peter; and the theory that the episcopate was itself one, and that each bishop shared equally in it. The unity was either in one see or in the less tangible unity of an order of the hierarchy. The former was the theory of the Roman bishops; the latter, the theory of Cyprian of Carthage, and possibly of a number of other ecclesiastics in North Africa and Asia Minor. Formerly polemical theology made the study of this point difficult, at least with anything like impartiality. In the passage given below from Cyprian's treatise On the Unity of the Catholic Church the text of the Jesuit Father Kirch is followed in the most difficult and interpolated chapter 4. As Father Kirch gives the text it is perfectly consistent with the theory of Cyprian as he has elsewhere stated it, and that the interpolated text is not. See, however, P. Battifol, Primitive Catholicism, Lond., 1911, Excursus E.
Additional source material: V. supra, [§ 27]; also Mirbt, §§ 56-69. The little treatise De Aleatoribus (MSL, 4: 827), from which Mirbt gives an extract (n. 71), might be cited in this connection, but its force depends upon its origin. It is wholly uncertain that it was written either by a bishop of Rome or in Italy. Cf. Bardenhewer. Kirch also gives the text in part, n. 276; for other references, see Kirch.
(a) Cyprian, De Catholicæ Ecclesiæ Unitate, 4, 5. (MSL, 4:513.)
The tract entitled On the Unity of the Catholic Church is the most famous of Cyprian's works. As the theory there developed is opposed to that which became dominant, and as Cyprian was regarded as the great upholder of the Church's constitution, interpolations were early made in the text which seriously distort the sense. These interpolations are to-day abandoned by all scholars. The best critical edition of the works of Cyprian is by W. von Hartel in the CSEL, but critical texts of the following passage with references to literature and indication of interpolations may be found in Mirbt (Prot.), n. 52, and in Kirch (R. C.), n. 234 (chapter 4 only).
Ch. 4. The Lord speaks to Peter, saying: “I say unto thee, that thou art Peter; and upon this rock I will build my Church and the gates of hell shall not prevail against it. I will give thee the keys of the Kingdom of Heaven; and whatsoever thou shalt bind on earth shall be bound also in heaven; and whatsoever thou shalt loose on earth shall be loosed also in heaven” (Matt. 16:18, 19). [To the same He says after His resurrection: “Feed my sheep” (John 21:15). Upon him He builds His Church, and to him He commits His sheep to be fed, and although. Interpolation.] Upon one he builds the Church, although also to all the Apostles after His resurrection He gives an equal power and says, “As the Father has sent me, I also send you: receive ye the Holy Ghost: whosesoever sins ye retain, they shall be retained” (John 20:21); yet, that He might show the unity, [He founded one see. Interpolation.] He arranged by His authority the origin of that unity as beginning from one. Assuredly the rest of the Apostles were also what Peter was, with a like partnership both of honor and power; but the beginning proceeds from unity [and the primacy is given to Peter. Interpolation.], that there might be shown to be one Church of Christ [and one see. And they are all shepherds, but the flock is shown to be one which is fed by the Apostles with unanimous consent. Interpolation.]. Which one Church the Holy Spirit also in the Song of Songs designates in the person of the Lord and says: “My dove, my spotless one, is but one. She is the only one of her mother, chosen of her that bare her” (Cant. 6:9). Does he who does not hold this unity of the Church [unity of Peter. Corrupt reading.] think that he holds the faith? Does he who strives against and resists the Church [who deserts the chair of Peter. Interpolation.] trust that he is in the Church, when, moreover, the blessed Apostle Paul teaches the same things and sets forth the sacrament of unity, saying, “There is one body and one spirit, one hope of your calling, one Lord, one faith, one baptism, one God”? (Eph. 4:4.)
Ch. 5. And this unity we ought to hold firmly and assert, especially we bishops who preside in the Church, that we may prove the episcopate itself to be one and undivided. Let no one deceive the brotherhood by a falsehood; let no one corrupt the truth by a perfidious prevarication. The episcopate is one, each part of which is held by each one in its entirety. The Church, also, is one which is spread abroad far and wide into a multitude by an increase of fruitfulness. As there are many rays of the sun, but one light, and many branches of a tree, but one strength based upon its tenacious root, and since from one spring flow many streams, although the multiplicity seems diffused in the liberality of an overflowing abundance, yet the unity is still preserved in its source.
(b) Firmilian of Cæesarea, Ep. ad Cyprianum, in Cyprian, Ep. 74 [=75]. (MSL, 3:1024.)
The matter in dispute was the rebaptism of those heretics who had received baptism before they conformed to the Church. See [§ 52]. It was the burning question after the rise of the Novatian sect. Stephen, bishop of Rome (254-257), had excommunicated a number of churches and bishops, among them probably Cyprian himself. See the epistle of Dionysius to Sixtus of Rome, the successor of Stephen, in Eusebius, Hist. Ec., VII, 5. “He” (Stephen) therefore had written previously concerning Helenus and Firmilianus and all those in Cilicia, Cappadocia, Galatia, and the neighboring countries, saying that he would not communicate with them for this same cause: namely, that they rebaptized heretics. This attitude of Stephen roused no little resentment in the East, as is shown by the indignant tone of Firmilian, who recognizes no authority in Rome. The text may be found in Mirbt, n. 74, and in part in Kirch, n. 274. The epistle of Firmilian is to be found among the epistles of Cyprian, to whom it was written.
Ch. 2. We may in this matter give thanks to Stephen that it has now happened through his unkindness [inhumanity] that we receive proof of your faith and wisdom.