St. Irenaeus of Lyons

Irenaeus originated from Smyrna, where he had seen and heard the preaching of Polycarp, who was in turn a disciple of John the Apostle.  This makes Irenaeus the last known living connection to the Apostles. During the persecution of Roman Emperor Marcus Aurelius, Irenaeus was a priest of the Church of Lyon, France. The clergy of that city, many of whom were suffering imprisonment for the faith, sent him in 177 to Rome with a letter to Pope Eleutherius concerning the heresy of Montanism.  While Irenaeus was in Rome, a persecution took place in Lyon resulting in Irenaeus succeeding the martyr Saint Pothinus as bishop of Lyon.  According to Eusebius, Irenaeus, in 190 or 191, convinced Pope Victor I not to excommunicate the Christian communities of Asia Minor which kept the practice of the Quartodeciman celebration of Easter.

His best-known work is Against Heresies, or Adversus Haereses, a refutation of gnosticism, in particular Valentinus.  Irenaeus said that there were three pillars of orthodoxy: the scriptures, the tradition handed down from the apostles, and the teaching of the apostles’ successors (later referred to as the Magisterium of the Church).  He upheld that the Church of Rome was the source of guidance for the universal Church.

Quotes from Irenaeus of Lyons:

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Against Heresies:

1:10:2

As I said before, the Church, having received this preaching and this faith, although she is disseminated throughout the whole world, yet guarded it, as if she occupied but one house. She likewise believes these things just as if she had but one soul and one and the same heart; and harmoniously she proclaims them and teaches them and hands them down, as if she possessed but one mouth. For, while the languages of the world are diverse, nevertheless, the authority of the tradition is one and the same

1:22

[The Gnostic disciples of Marcus] have deluded many women. . . . Their consciences have been branded as with a hot iron. Some of these women make a public confession, but others are ashamed to do this, and in silence, as if withdrawing from themselves the hope of the life of God, they either apostatize entirely or hesitate between the two courses

2:22:4

He [Jesus] came to save all through himself; all, I say, who through him are reborn in God: infants, and children, and youths, and old men. Therefore he passed through every age, becoming an infant for infants, sanctifying infants; a child for children, sanctifying those who are of that age . . . [so that] he might be the perfect teacher in all things, perfect not only in respect to the setting forth of truth, perfect also in respect to relative age

3:3:1-2

It is possible, then, for everyone in every church, who may wish to know the truth, to contemplate the tradition of the apostles which has been made known throughout the whole world. And we are in a position to enumerate those who were instituted bishops by the apostles and their successors to our own times—men who neither knew nor taught anything like these heretics rave about.

“But since it would be too long to enumerate in such a volume as this the successions of all the churches, we shall confound all those who, in whatever manner, whether through self-satisfaction or vainglory, or through blindness and wicked opinion, assemble other than where it is proper, by pointing out here the successions of the bishops of the greatest and most ancient church known to all, founded and organized at Rome by the two most glorious apostles, Peter and Paul, that church which has the tradition and the faith which comes down to us after having been announced to men by the apostles.

“With this church, because of its superior origin, all churches must agree—that is, all the faithful in the whole world—and it is in her that the faithful everywhere have maintained the apostolic tradition

3:4:1

That is why it is surely necessary to avoid them [heretics], while cherishing with the utmost diligence the things pertaining to the Church, and to lay hold of the tradition of truth. . . . What if the apostles had not in fact left writings to us? Would it not be necessary to follow the order of tradition, which was handed down to those to whom they entrusted the churches?

3:22:24

Consequently, then, Mary the Virgin is found to be obedient, saying, ‘Behold, O Lord, your handmaid; be it done to me according to your word.’ Eve, however, was disobedient, and, when yet a virgin, she did not obey. Just as she, who was then still a virgin although she had Adam for a husband—for in paradise they were both naked but were not ashamed; for, having been created only a short time, they had no understanding of the procreation of children, and it was necessary that they first come to maturity before beginning to multiply—having become disobedient, was made the cause of death for herself and for the whole human race; so also Mary, betrothed to a man but nevertheless still a virgin, being obedient, was made the cause of salvation for herself and for the whole human race. . . . Thus, the knot of Eve’s disobedience was loosed by the obedience of Mary. What the virgin Eve had bound in unbelief, the Virgin Mary loosed through faith.

3:24:1

In the Church God has placed apostles, prophets, teachers, and every other working of the Spirit, of whom none of those are sharers who do not conform to the Church, but who defraud themselves of life by an evil mind and even worse way of acting. Where the Church is, there is the Spirit of God; where the Spirit of God is, there is the Church and all grace

4:17:5

He took from among creation that which is bread, and gave thanks, saying, ‘This is my body.’ The cup likewise, which is from among the creation to which we belong, he confessed to be his blood. He taught the new sacrifice of the new covenant, of which Malachi, one of the twelve [minor] prophets, had signified beforehand: ‘You do not do my will, says the Lord Almighty, and I will not accept a sacrifice at your hands. For from the rising of the sun to its setting my name is glorified among the Gentiles, and in every place incense is offered to my name, and a pure sacrifice; for great is my name among the Gentiles, says the Lord Almighty’ [Mal. 1:10–11]. By these words he makes it plain that the former people will cease to make offerings to God; but that in every place sacrifice will be offered to him, and indeed, a pure one, for his name is glorified among the Gentiles

4:26:3

Those . . . who are believed to be presbyters by many, but serve their own lusts and do not place the fear of God supreme in their hearts, but conduct themselves with contempt toward others and are puffed up with the pride of holding the chief seat [Matt. 23:6] and work evil deeds in secret, saying ‘No man sees us,’ shall be convicted by the Word, who does not judge after outward appearance, nor looks upon the countenance, but the heart; and they shall hear those words to be found in Daniel the prophet: ‘O you seed of Canaan and not of Judah, beauty has deceived you and lust perverted your heart’ [Dan. 13:56]. You that have grown old in wicked days, now your sins which you have committed before have come to light, for you have pronounced false judgments and have been accustomed to condemn the innocent and to let the guilty go free, although the Lord says, ‘You shall not slay the innocent and the righteous

4:33:7-8

[The spiritual man] shall also judge those who give rise to schisms, who are destitute of the love of God, and who look to their own special advantage rather than to the unity of the Church; and who for trifling reasons, or any kind of reason which occurs to them, cut in pieces and divide the great and glorious body of Christ, and so far as in them lies, destroy it—men who prate of peace while they give rise to war, and do in truth strain out a gnat, but swallow a camel. For they can bring about no ‘reformation’ of enough importance to compensate for the evil arising from their schism. . . . True knowledge is that which consists in the doctrine of the apostles, and the ancient constitution of the Church throughout all the world, and the distinctive manifestation of the body of Christ according to the successions of the bishops, by which they have handed down that Church which exists in every place [i.e., the Catholic Church]

4:33:32

If the Lord were from other than the Father, how could he rightly take bread, which is of the same creation as our own, and confess it to be his body and affirm that the mixture in the cup is his blood?

4:37:7

[Paul], an able wrestler, urges us on in the struggle for immortality, so that we may receive a crown and so that we may regard as a precious crown that which we acquire by our own struggle and which does not grow upon us spontaneously. . . . Those things which come to us spontaneously are not loved as much as those which are obtained by anxious care

5:2

He has declared the cup, a part of creation, to be his own blood, from which he causes our blood to flow; and the bread, a part of creation, he has established as his own body, from which he gives increase unto our bodies. When, therefore, the mixed cup [wine and water] and the baked bread receives the Word of God and becomes the Eucharist, the body of Christ, and from these the substance of our flesh is increased and supported, how can they say that the flesh is not capable of receiving the gift of God, which is eternal life—flesh which is nourished by the body and blood of the Lord, and is in fact a member of him?

5:6:1

In like manner we do also hear many brethren in the Church who possess prophetic gifts and who through the Spirit speak all kinds of languages and who bring to light for the general benefit the hidden things of men, and declare the mysteries of God

5:19:1

“The Lord then was manifestly coming to his own things, and was sustaining them by means of that creation that is supported by himself. He was making a recapitulation of that disobedience that had occurred in connection with a tree, through the obedience that was upon a tree [i.e., the cross]. Furthermore, the original deception was to be done away with—the deception by which that virgin Eve (who was already espoused to a man) was unhappily misled. That this was to be overturned was happily announced through means of the truth by the angel to the Virgin Mary (who was also [espoused] to a man). . . . So if Eve disobeyed God, yet Mary was persuaded to be obedient to God. In this way, the Virgin Mary might become the advocate of the virgin Eve. And thus, as the human race fell into bondage to death by means of a virgin, so it is rescued by a virgin. Virginal disobedience has been balanced in the opposite scale by virginal obedience. For in the same way, the sin of the first created man received amendment by the correction of the First-Begotten