adj.同为永远的；永远共存的
And the whole three persons are coeternal together and coequal, there is nothing before or after, nothing greater of less. 三位都是永恒而且同等的，无分先后，无别尊卑。
But the whole three persons are coeternal, and coequal. So that in all things, as aforesaid, the Unity in Trinity and the Trinity in Unity is to be worshipped. 但三个位格都同等同永存。所以一切都当与上述所说，在神里我们敬拜三个位格，而在三个位格里我们敬拜一位神。
The first moment describes a radical dualism in a previous age.Light and darkness (good and evil), personified in the Father of Lights and the Prince of Darkness, were both coeternal and independent. 第一个片刻描绘了在前一个纪元里的一种根本的二元论，光明与黑暗（善良与邪恶），在光之父亲和恶魔里面给予了人格化，同时都是永远共存和不受约束的。
