Simon I know you hate cut and paste jobs but humor me for this one (or just skip over it):
CHURCH UNITY
About the time of the opening of the council (251), two letters arrived from Rome. One of these, announcing the election of a pope, St. Cornelius, was read by Cyprian to the assembly; the other contained such violent and improbable accusations against the new pope that he thought it better to pass it over. But two bishops, Caldonius and Fortunatus, were dispatched to Rome for further information, and the whole council was to await their return-such was the importance of a papal election. Meantime another message arrived with the news that Novatian, the most eminent among the Roman clergy, had been made pope. Happily two African prelates, Pompeius and Stephanus, who had been present at the election of Cornelius, arrived also, and were able to testify that he had been validly set "in the place of Peter", when as yet there was no other claimant. It was thus possible to reply to the recrimination of Novatian's envoys, and a short letter was sent to Rome, explaining the discussion which had taken place in the council. Soon afterwards came the report of Caldonius and Fortunatus together with a letter from Cornelius, in which the latter complained somewhat of the delay in recognizing him. Cyprian wrote to Cornelius explaining his prudent conduct. He added a letter to the confessors who were the main support of the antipope, leaving it to Cornelius whether it should be delivered or no. He sent also copies of his two treatises, "De Unitate" and "De Lapsis" (this had been composed by him immediately after the other), and he wishes the confessors to read these in order that they may understand what a fearful thing is schism. It is in this copy of the "De Unitate" that Cyprian appears most probably to have added in the margin an alternative version of the fourth chapter.
The original passage, as found in most manuscripts and as printed in Hartel's edition, runs thus:
If any will consider this, there is no need of a long treatise and of arguments. 'The Lord saith to Peter: '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; to thee I will give the keys to the kingdom of heaven, and what thou shalt have bound on earth shall be bound in heaven, and what thou shalt have loosed shall be loosed in heaven.' Upon one He builds His Church, and though to all His Apostles after His resurrection He gives an equal power and says: 'As My Father hath sent Me, even so send I you: Receive the Holy Ghost, whosesoever sins you shall have remitted they shall be remitted unto them, and whosesoever sins you shall have retained they shall be retained', yet that He might make unity manifest, He disposed the origin of that unity beginning from one. The other Apostles were indeed what Peter was, endowed with a like fellowship both of honour and of power, but the commencement proceeds from one, that the Church may be shown to be one. This one Church the Holy Ghost in the person of the Lord designates in the Canticle of Canticles, and says, One is My Dove, My perfect one, one is she to her mother, one to her that bare her. He that holds not this unity of the Church, does he believe that he holds the Faith? He who strives against and resists the Church, is he confident that he is in the Church?
The substituted passage is as follows:. . . bound in heaven. Upon one He builds His Church, and to the same He says after His resurrection, 'feed My sheep'. And though to all His Apostles He gave an equal power yet did He set up one chair, and disposed the origin and manner of unity by his authority. The other Apostles were indeed what Peter was, but the primacy is given to Peter, and the Church and the chair is shown to be one. And all are pastors, but the flock is shown to be one, which is fed by all the Apostles with one mind and heart. He that holds not this unity of the Church, does he think that he holds the faith? He who deserts the chair of Peter, upon whom the Church is founded, is he confident that he is in the Church?
These alternative versions are given one after the other in the chief family of manuscripts which contains them, while in some other families the two have been partially or wholly combined into one. The combined version is the one which has been printed in man editions, and has played a large part in controversy with Protestants. It is of course spurious in this conflated form, but the alternative form given above is not only found in eighth- and ninth-century manuscripts, but it is quoted by Bede, by Gregory the Great (in a letter written for his predecessor Pelagius II), and by St. Gelasius; indeed, it was almost certainly known to St. Jerome and St. Optatus in the fourth century. The evidence of the manuscripts would indicate an equally early date. Every expression and thought in the passage can be paralleled from St. Cyprian's habitual language, and it seems to be now generally admitted that this alternative passage is an alteration made by the author himself when forwarding his work to the Roman confessors. The "one chair" is always in Cyprian the episcopal chair, and Cyprian has been careful to emphasize this point, and to add a reference to the other great Petrine text, the Charge in John, xxi. The assertion of the equality of the Apostles as Apostles remains, and the omissions are only for the sake of brevity. The old contention that it is a Roman forgery is at all events quite out of the question. Another passage is also altered in all the same manuscripts which contain the "interpolation"; it is a paragraph in which the humble and pious conduct of the lapsed "on this hand (hic) is contrasted in a long succession of parallels with the pride and wickedness of the schismatics "on that hand" (illic), but in the delicate manner of the treatise the latter are only referred to in a general way. In the "interpolated" manuscripts we find that the lapsed, whose caused had now been settled by the council, are "on that hand" (illic), whereas the reference to the schismatics -- meaning the Roman confessors who were supporting Novatian, and to whom the book was being sent -- are made as pointed as possible, being brought into the foreground by the repeated hic, "on this hand".
http://www.newadvent.org/cathen/04583b.htm
