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Consubstantiality

Christian theology of the Trinity

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Through Jesus

It appears most commonly in its adjectival form, "consubstantial", from Latin consubstantialis, and its best-known use is in regard to an account, in Christian theology, of the relation between Jesus Christ and God the Father.

Theological use

The affirmation that Jesus Christ is "consubstantial with the Father" appears in the Nicene Creed. Greek was the language in which the Nicene Creed was originally enunciated. The word used was Greek: ὁμοούσιος (homoousios) and means "of the same substance." This may be contrasted with the term ὁμοιούσιος (homoiousios), meaning "of like substance" and, therefore, not the "same substance," as was proposed, for example, at a later church council (the Council of Seleucia regarding the Arian controversy) in the year 359.

The term οὐσία (ousia) is an Ancient Greek noun, formed on the feminine present participle of the verb εἰμί, eimí, meaning "to be, I am", so similar grammatically to the English noun "being". There was no equivalent grammatical formation in Latin, and it was translated as essentia or substantia and then indirectly into English as "essence" or "substance". Cicero coined essentia and the philosopher Seneca and rhetorician Quintilian used it as equivalent for οὐσία, while Apuleius rendered οὐσία both as essentia or substantia. In order to designate οὐσία, early Christian theologian Tertullian favored the use of substantia over essentia, while Augustine of Hippo and Boethius took the opposite stance, preferring the use of essentia as designation for οὐσία.

The word "consubstantial" was used by the Council of Chalcedon (451) to declare that Christ is "consubstantial with the Father in respect of the Godhead, and the same consubstantial with us in respect of the manhood".

In contemporary Christian theology, the Holy Spirit is also described as consubstantial with the Father and Son.

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