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Equally or jointly eternal.

co′e·ter′nal·ly adv.


existing together eternally
ˌcoeˈternally adv
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References in classic literature ?
Hail holy light, ofspring of Heav'n first-born, Or of th' Eternal Coeternal beam May I express thee unblam'd?
Moreover, the Supreme Being includes no contingency regarding the causation of the demiurgic Creator; because being the Source of all existence, He is coexistent and coeternal with the 'Suns', His eternal heavenly manifestations, one of whom is Mbumba Lowa, the creator of our universe.
13) Matter is therefore not uncreated or coeternal with God.
Muslims too may wonder if Derrida's claim that messianicity supersedes even Quranic revelation, or belief in an uncreated and coeternal Book, is not a disingenuous strategy for asserting the cultural hegemony of a historically specific universalism, one that has more in common with Judaic religion than either Islam or Christianity.
Despair followed by resignation in front of the fatality of the vast cosmic mechanism governed by periodic storms and disasters; the reference here to the equinox surely makes reference to the time when light and darkness are equal: this is when the fight is strongest, when the two coeternal opposites (good and evil, light and darkness) struggle for supremacy.
As the eternally begotten self-expression of the one, true, infinite and eternal God, the Son is coequal and coeternal with the Father.
In one of his several creation sequences, Hesiod makes Night and Eros coeternal to Gaia who both brings forth Ouranos, "without any act of love" and takes him as a husband with consequences essential to discussion of the Woman of Trachis.
Of course, the idea that there is a balance between good and evil is I Ching philosophy (which predates both Taoism and Confucianism) and not Christianity since the I Ching seems to endorse metaphysical dualism or the belief that good and evil are both positive, coeternal substances, whereas Christianity maintains that God, who is Goodness itself, only made good things, and so evil must simply be the absence or privation of a good that should be present (for instance, when a person steals something, there is a lack of proper self-control in the will).
Your wisdom is manifestly coeternal and equal with you,
spectacularizes O'Grady's ongoing condition of being both part of and not part of, inside and outside, a society that relies on coeternal binary opposition.
but all three persons are coeternal with each other and coequal.
Arius was sure Jesus was subordinate to the Father, Athanasius that he was coequal and coeternal.