Theological Term of the Week

consubstantial
Of the same nature; of one essence; an equivalent for the Greek term homoousios.

• From The Nicene Creed:

We believe in one God, the Father Almighty, Maker of all things visible and invisible.

And  in one Lord Jesus Christ, the Son of God, the only-begotten of the Father.

That is, of the substance of the Father; God of God and Light of light; true God of true God; begotten, not made, consubstantial with the Father.

By whom all things were made, both which are in heaven and on earth: who for the sake of us men, and on account of our salvation, descended, became incarnate, and was made man; suffered, arose again the third day, and ascended into the heavens, and will come again to judge the living and the dead.

We believe in the Holy Spirit, the Lord, the giver of life,
who proceeds from the Father [and the Son].
With the Father and the Son
he is worshipped and glorified.
He has spoken through the Prophets.
We believe in one holy catholic and apostolic Church.
We acknowledge one baptism for the forgiveness of sins.
We look for the resurrection of the dead,
and the life of the world to come. Amen.

• From The Chalcedon Creed:

We, then, following the holy Fathers, all with one consent, teach men to confess one and the same Son, our Lord Jesus Christ, the same perfect in Godhead and also perfect in manhood; truly God and truly man, of a reasonable (rational) soul and body; consubstantial (coessential) with the Father according to the Godhead, and consubstantial with us according to the Manhood; in all things like unto us, without sin; begotten before all ages of the Father according to the Godhead, and in these latter days, for us and for our salvation, born of the Virgin Mary, the Mother of God, according to the Manhood; one and the same Christ, Son, Lord, Only-begotten, to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably; the distinction of natures being by no means taken away by the union, but rather of the property of each nature being preserved, and concurring in one Person and one Subsistence, not parted or divided into two persons, but one and the same Son, and only begotten, God, the Word the Lord Jesus Christ; as the prophets from the beginning (have declared) concerning him, and the Lord Jesus Christ himself has taught us, and the Creed of the holy Fathers has handed down to us.

• From James E. Keifer’s comments on The Nicene Creed: 

  This line: “of one essence with the Father, of one substance with the Father, consubstantial with the Father,” (in Greek, HOMO-OUSIOS TW PATRI) was the crucial one, the acid test. It was the one formula that the Arians could not interpret as meaning what they believed. Without it, they would have continued to teach that the Son is good, and glorious, and holy, and a Mighty Power, and God’s chief agent in creating the world, and the means by which God chiefly reveals Himself to us, and therefore deserving in some sense to be called divine. But they would have continued to deny that the Son was God in the same sense in which the Father is God. And they would have pointed out that, since the Council of Nicea had not issued any declaration that they could not accept, it followed that there was room for their position inside the tent of Christian doctrine, as that tent had been defined at Nicea. Arius and his immediate followers would have denied that they were reducing the Son to the position of a high-ranking angel. But their doctrine left no safeguard against it, and if they had triumphed at Nicea, even in the negative sense of having their position acknowledged as a permissible one within the limits of Christian orthodoxy, the damage to the Christian witness to Christ as God made flesh would have been irreparable.

Learn more:

1. Encyclo: Definitions of Consubstantial
2. basictheology.com: Homoousios
3. James E. Keifer: Notes on the Nicene Creed

Related terms:

• Nicene Creed
• Chalcedonian Definition
• essence
• Arianism

Filed under Christ’s Nature and His Work.

This week’s term was suggested by Staci Eastin. Do you have a term you’d like to see featured here as a Theological Term of the Week? If you email it to me, I’ll seriously consider using it, giving you credit for the suggestion and linking back to your blog when I do.

Clicking on the Theological Term graphic at the top of this post will take you to a list of all the previous theological terms in alphabetical order.