St. Leo IX, 1049-1054

[From the epistle "Congratulamur vehementer" to Peter, Bishop of Antioch, April 13, 1053]

For I firmly believe that the Holy Trinity, the Father and the Son and the Holy Spirit, is one omnipotent God, and in the Trinity the whole Godhead is co-essential and consubstantial, co-eternal and co-omnipotent, and of one will, power, and majesty; the creator of all creation, from whom all things, through whom all things, in whom all things [Rom. 11:36] which are in heaven or on earth, visible or invisible. Likewise I believe that each person in the Holy Trinity is the one true God, complete and perfect.

I believe also that the Son of God the Father, the Word of God, was born eternally before all time from the Father, consubstantial, co-omnipotent, and co-equal to the Father through all things in divinity; born of the Holy Spirit from the ever virgin Mary in time, with a rational soul, having two nativities, the one from the Father, eternal, the other from the Mother, in time; having two wills and operations, true God and true man, individual in each nature and perfect, not having suffered a fusion and division, not adopted or phantastical, the one and only God, the Son of God in two natures, but in the singleness of one person, incapable of suffering and immortal in divinity; but in humanity for us and for our salvation suffered in the true passion of the body and was buried, and arose from the dead on the third day in the true resurrection of the body; because of which we must declare with the disciples that He ate from no need of food but only from will and power; on the fortieth day after His resurrection with the flesh in which He arose, and with His soul He ascended into heaven and sits at the right hand of the Father, whence on the tenth day He sent the Holy Spirit, and thence, as He ascended, He will come to judge the living and the dead, and will render to each one according to his works.

I believe also that the Holy Spirit, complete and perfect and true God, proceeding from the Father and the Son, co-equal, co-essential, co-omnipotent and co-eternal with the Father and the Son in all respects, has spoken through the prophets.

That this holy and individual Trinity is not three Gods, but in three persons and in one nature or essence [is] one God omnipotent, external, invisible and incommutable, so I believe and confess, so that I may truly proclaim that the Father is not begotten, the Son is the only begotten one, and the Holy Spirit is neither begotten nor unbegotten, but proceeds from the Father and the Son.

(Variant Readings:) I believe that the one true Church is holy, Catholic and apostolic, in which is given one baptism and the true remission of all sins. I also believe in a true resurrection of this body, which now I bear, and in eternal life.

I believe also that there is one author of the New and Old Testament, of the law both of the Prophets and of the Apostles, namely the omnipotent God and Lord. (I believe) that God predestined only the good things, but that He foreknew the good and the evil. I believe and profess that the grace of God precedes and follows man, yet in such a manner that I do not deny free will to the rational creature. I also believe and declare that the soul is not a part of God but was created from nothing and was without baptism subject to original sin.

Furthermore, I declare anathema every heresy raising itself against the holy Catholic Church, and likewise him whosoever has honored or believes that any writings beyond those which the Catholic Church accepts ought to be held in authority or has venerated them. I accept entirely the four Councils and I venerate them as the four Gospels, because through four parts of the world the universal Church, upon these as on square stone, has been founded *. . . . Equally I accept and venerate the three remaining Councils. . . . Whatever the above mentioned seven holy and universal Councils believe and praise I also believe and praise, and whomever they declare anathema, I declare anathema.

[From the epistle "In terra pax hominibus" to Michael Cerularius and to Leo of Achrida, September 2, 1053]

Chap. 5 . . . You are said to have condemned publicly in a strange presumption and incredible boldness the Apostolic and Latin Church, neither heard nor refuted, for the reason chiefly that it dared to celebrate the commemoration of the passion of the Lord from the Azymes. Behold your incautious reprehension, behold your evil boasting, when "you put your mouth into heaven. When your tongue passing on to the earth" [ Ps. 72:9], by human arguments and conjectures attempts to uproot and overturn the ancient faith. . . .

Chap. 7 . . . The holy Church built upon a rock, that is Christ, and uponPeteror Cephas, the son of John who first was called Simon, because by the gates of Hell, that is, by the disputations of heretics which lead the vain to destruction, it would never be overcome; thus Truth itself promises, through whom are true, whatsoever things are true: "The gates of hell will not prevail against it" [Matt. 16:18]. The same Son declares that He obtained the effect of this promise from the Father by prayers, by saying to Peter: "Simon, behold Satan etc." [ Luke 23:31]. Therefore, will there be anyone so foolish as to dare to regard His prayer as in anyway vain whose being willing is being able? By the See of the chief of the Apostles, namely by the Roman Church, through the same Peter, as well as through his successors, have not the comments of all the heretics been disapproved, rejected, and overcome, and the hearts of the brethren in the faith of Peter which so far neither has failed, nor up to the end will fail, been strengthened?

Chap. 11. By passing a preceding judgment on the great See, concerning which it is not permitted any man to pass judgment, you have received anathema from all the Fathers of all the venerable Councils. . . .

Chap. 32 . . . As the hinge while remaining immovable opens and closes the door, so Peter and his successors have free judgment over all the Church, since no one should remove their status because "the highest See is judged by no one." [see n. 330 ff.]