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christian-theology-properfeatured in 40 works

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

  1. John
    Ephesus · 100
    explains
  2. Against Praxeas.
    · 220
    explains
  3. A Treatise of Novatian Concerning the Trinity.
    Rome · 258
    explains
  4. The Church History of Eusebius
    Caesarea · 339
    explains
  5. Against the Arians. (Orationes contra Arianos IV.)
    Alexandria · 373
    explains
  6. On the Councils of Ariminum and Seleucia. (De Synodis.)
    Alexandria · 373
    explains
  7. Defence of the Nicene Definition. (De Decretis.)
    Alexandria · 373
    explains
  8. Defence of Dionysius. (De Sententia Dionysii.)
    Alexandria · 373
    explains
  9. Letters of Athanasius with Two Ancient Chronicles of His Life
    Alexandria · 373
    explains
  10. On Luke x. 22. (Illud Omnia, &c.)
    Alexandria · 373
    explains
  11. Letter of Eusebius. (Epistola Eusebii.)
    Alexandria · 373
    explains
  12. Synodal Letter to the Bishops of Africa. (Ad Afros Epistola Synodica.)
    Alexandria · 373
    explains
  13. The Letters
    Caesarea (Cappadocia) · 379
    explains
  14. De Spiritu Sancto
    Caesarea (Cappadocia) · 379
    explains
  15. The Second Ecumenical Council: The First Council of Constantinople
    Constantinople (Istanbul) · 381
    explains
  16. The Catechetical Lectures of S. Cyril
    Jerusalem · 386
    explains
  17. Select Orations of Saint Gregory Nazianzen
    Nazianzus · 390
    explains
  18. Against Eunomius
    Nyssa · 395
    explains
  19. Answer to Eunomius' Second Book
    Nyssa · 395
    explains
  20. Exposition of the Christian Faith
    Milan · 397
    explains
  21. On the Holy Spirit
    Milan · 397
    explains
  22. The Homilies of St. John Chrysostom on the Gospel of St. John
    Constantinople (Istanbul) · 407
    explains
  23. The Homilies of St. John Chrysostom
    Constantinople (Istanbul) · 407
    explains
  24. The Homilies of St. John Chrysostom on Philippians, Colossians, and Thessalonians
    Constantinople (Istanbul) · 407
    explains
  25. The Homilies of St. John Chrysostom on the Epistle to the Hebrews
    Constantinople (Istanbul) · 407
    explains
  26. The Commentary and Homilies of St. John Chrysostom on Galatians and Ephesians
    Constantinople (Istanbul) · 407
    explains
  27. Jerome and Gennadius. Lives of Illustrious Men
    Bethlehem · 420
    explains
  28. On the Holy Trinity
    Hippo Regius · 430
    explains
  29. Lectures or Tractates on the Gospel According to St. John
    Hippo Regius · 430
    explains
  30. Sermons on Selected Lessons of the New Testament
    Hippo Regius · 430
    explains
  31. Expositions on the Book of Psalms
    Hippo Regius · 430
    explains
  32. The Ecclesiastical History of Socrates Scholasticus
    Constantinople (Istanbul) · 439
    explains
  33. The Ecclesiastical History of Sozomen
    Constantinople (Istanbul) · 450
    explains
  34. The Ecclesiastical History, Dialogues, and Letters of Theodoret
    Cyrrhus · 458
    explains
  35. The Letters and Sermons of Leo the Great
    Rome · 461
    explains
  36. John of Damascus: Exposition of the Orthodox Faith
    Damascus · 749
    explains
  37. Monologium
    Canterbury · 1109
    explains
  38. Treatise on The Most Holy Trinity (QQ[27-43])
    Paris · 1274
    explains
  39. Treatise on the Incarnation (qq[1]-59)
    Paris · 1274
    explains
  40. Book First. of the Knowledge of God the Creator
    Geneva · 1564
    explains

Key passages(20)

Exposition of the Christian Faith · Ambrose of Milan

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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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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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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

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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

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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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‘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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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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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

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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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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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[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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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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Against Eunomius · Gregory of Nyssa

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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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Against Eunomius · Gregory of Nyssa

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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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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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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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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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