Consubstantiality (Homoousios)
One word that anchored the Creed: the Son is of the very same being as the Father
Homoousios affirms that the Son is of the same essence or substance as the Father, fully and equally God. Enshrined in the Nicene Creed and defended by Athanasius, the term was initially controversial because it was not biblical wording, yet it was universally received as orthodox after Nicaea and Constantinople. It safeguards the full divinity of Christ against any teaching that would make the Son a lesser or created being.
How it traveled
- JohnEphesus · 100explains
- Against Praxeas.— · 220explains
- A Treatise of Novatian Concerning the Trinity.Rome · 258explains
- The Church History of EusebiusCaesarea · 339explains
- Against the Arians. (Orationes contra Arianos IV.)Alexandria · 373explains
- On the Councils of Ariminum and Seleucia. (De Synodis.)Alexandria · 373explains
- Defence of the Nicene Definition. (De Decretis.)Alexandria · 373explains
- Defence of Dionysius. (De Sententia Dionysii.)Alexandria · 373explains
- Letters of Athanasius with Two Ancient Chronicles of His LifeAlexandria · 373explains
- On Luke x. 22. (Illud Omnia, &c.)Alexandria · 373explains
- Letter of Eusebius. (Epistola Eusebii.)Alexandria · 373explains
- Synodal Letter to the Bishops of Africa. (Ad Afros Epistola Synodica.)Alexandria · 373explains
- The LettersCaesarea (Cappadocia) · 379explains
- De Spiritu SanctoCaesarea (Cappadocia) · 379explains
- The Second Ecumenical Council: The First Council of ConstantinopleConstantinople (Istanbul) · 381explains
- The Catechetical Lectures of S. CyrilJerusalem · 386explains
- Select Orations of Saint Gregory NazianzenNazianzus · 390explains
- Against EunomiusNyssa · 395explains
- Answer to Eunomius' Second BookNyssa · 395explains
- Exposition of the Christian FaithMilan · 397explains
- On the Holy SpiritMilan · 397explains
- The Homilies of St. John Chrysostom on the Gospel of St. JohnConstantinople (Istanbul) · 407explains
- The Homilies of St. John ChrysostomConstantinople (Istanbul) · 407explains
- The Homilies of St. John Chrysostom on Philippians, Colossians, and ThessaloniansConstantinople (Istanbul) · 407explains
- The Homilies of St. John Chrysostom on the Epistle to the HebrewsConstantinople (Istanbul) · 407explains
- The Commentary and Homilies of St. John Chrysostom on Galatians and EphesiansConstantinople (Istanbul) · 407explains
- Jerome and Gennadius. Lives of Illustrious MenBethlehem · 420explains
- On the Holy TrinityHippo Regius · 430explains
- Lectures or Tractates on the Gospel According to St. JohnHippo Regius · 430explains
- Sermons on Selected Lessons of the New TestamentHippo Regius · 430explains
- Expositions on the Book of PsalmsHippo Regius · 430explains
- The Ecclesiastical History of Socrates ScholasticusConstantinople (Istanbul) · 439explains
- The Ecclesiastical History of SozomenConstantinople (Istanbul) · 450explains
- The Ecclesiastical History, Dialogues, and Letters of TheodoretCyrrhus · 458explains
- The Letters and Sermons of Leo the GreatRome · 461explains
- John of Damascus: Exposition of the Orthodox FaithDamascus · 749explains
- MonologiumCanterbury · 1109explains
- Treatise on The Most Holy Trinity (QQ[27-43])Paris · 1274explains
- Treatise on the Incarnation (qq[1]-59)Paris · 1274explains
- Book First. of the Knowledge of God the CreatorGeneva · 1564explains
Key passages(20)
Defence of the Nicene Definition. (De Decretis.) · Athanasius of Alexandria
The Arians allowed that our Lord was like and the image of the Father, but in the sense in which a picture is like the original, differing from it in substance and in fact. In this sense they even all
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Exposition of the Christian Faith · Ambrose of Milan
16. Wherefore let the Arians observe, how impious they are in calling in question our hope and the object of our desires. And since they are wont to cry out on this point above all others, saying that
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On the Councils of Ariminum and Seleucia. (De Synodis.) · Athanasius of Alexandria
54. This is why the Nicene Council was correct in writing, what it was becoming to say, that the Son, begotten from the Father’s essence, is coessential with Him. And if we too have been taught the sa
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Sermons on Selected Lessons of the New Testament · Augustine of Hippo
Sermon LXXXIX. [CXXXIX. Ben.] On the words of the Gospel, John x. 30, “I and the Father are one.” 1. Ye have heard what the Lord God, Jesus Christ, the Only Son of God, born of God the Father witho
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The Fifth Ecumenical Council. The Second Council of Constantinople · The Ecumenical Councils
The Capitula of the Council. (Labbe and Cossart, Concilia, Tom. V., col. 568.) I. If anyone shall not confess that the nature or essence of the Father, of the Son, and of the Holy Ghost is one, as
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The First Ecumenical Council: The First Council of Nice · The Ecumenical Councils
The Nicene Creed. (Found in the Acts of the Ecumenical Councils of Ephesus and Chalcedon, in the Epistle of Eusebius of Cæsarea to his own Church, in the Epistle of St. Athanasius Ad Jovianum Imp., i
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The Ecclesiastical History of Socrates Scholasticus · Socrates Scholasticus
‘A variety of topics having been introduced by each party and much controversy being excited from the very commencement, the emperor listened to all with patient attention, deliberately and impartiall
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The Ecclesiastical History, Dialogues, and Letters of Theodoret · Theodoret of Cyrus
Thus this noble character mixed intimidation with deceit and so endeavoured to persuade and compel the people to apostatise from true religion. They however knew full well how true it is that the pain
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Against the Arians. (Orationes contra Arianos IV.) · Athanasius of Alexandria
Discourse III. ———————————— Chapter XXIII.—Texts Explained; Seventhly, John xiv. 10 Introduction. The doctrine of the coinherence. The Father and the Son Each whole and perfect God. They are in Each
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Exposition of the Christian Faith · Ambrose of Milan
114. Now I know that some assert that the mystic incarnate form was uncreated, forasmuch as nothing was done therein through intercourse with a man, because our Lord was the offspring of a virgin. If,
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On the Holy Trinity · Augustine of Hippo
3. But if nothing is spoken of the Father as such, except that which is spoken of Him in relation to the Son, that is, that He is His father, or begetter, or beginning; and if also the begetter is by
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On the Holy Trinity · Augustine of Hippo
4. Wherefore, our Lord God helping, we will undertake to render, as far as we are able, that very account which they so importunately demand: viz., that the Trinity is the one and only and true God, a
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On the Holy Trinity · Augustine of Hippo
[The term Trinity denotes the Divine essence in all three modes. The term Father (or Son, or Spirit) denotes the essence in only one mode. Consequently, there is something in the Trinity that cannot b
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Treatise on The Most Holy Trinity (QQ[27-43]) · Thomas Aquinas
Objection 6: Further, nothing should be said of God which can be occasion of error. Now, to say that the three persons are of one essence or substance, furnishes occasion of error. For, as Hilary says
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But at all events he will allow that this supremacy of being betokens no excess of power, or of goodness, or of anything of that kind. Every one knows that, not to mention those whose knowledge is sup
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The lord-lieutenant kept appealing to the commands of the Emperor, and rendering a power, which from its enormous strength was terrible enough, more terrible still by the unsparing cruelty of its veng
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Book First. of the Knowledge of God the Creator · John Calvin
20. Let those, then, who love soberness, and are contented with the measure of faith, briefly receive what is useful to be known. It is as follows:—When we profess to believe in one God, by the name G
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Book First. of the Knowledge of God the Creator · John Calvin
Nor does another cavil avail them, that Christ was God in his Father. For though we admit that, in respect of order and gradation, the beginning of divinity is in the Father, we hold it a detestable f
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Defence of the Nicene Definition. (De Decretis.) · Athanasius of Alexandria
περιβολὴ, and so de Syn. §34. which is very much the same passage. Some Fathers, however, seem to say the reverse. E.g. Nazianzen says that ‘neither the immateriality of God nor ingenerateness, presen
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Defence of the Nicene Definition. (De Decretis.) · Athanasius of Alexandria
υἱοποιούμεθα ἀληθῶς. This strong term ‘truly’ or ‘verily’ seems taken from such passages as speak of the ‘grace and truth’ of the Gospel, John i. 12–17. Again S. Basil says, that we are sons, κυρίως,
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