EUGENIUS III 1145-1153
COUNCIL OF RHEIMS 1148
Confession of Faith in the Trinity
389 1. We believe and confess that God is the simple nature of divinity, and that it cannot be denied in any Catholic sense that God is divinity, and divinity is God. Moreover, if it is said that God is wise by wisdom, great by magnitude, eternal by eternity, one by oneness, God by divinity, and other such things, we believe that He is wise only by that wisdom which is God Himself; that He is great only by that magnitude which is God Himself; that He is eternal only by that eternity which is God Himself; that He is one only by the oneness which is God Himself; that He is God only by that divinity which He is Himself; that is, that He is wise, great, eternal, one God of Himself.
390 2. When we speak of three persons: Father, Son, and Holy Spirit, we confess that they are one God, one divine substance. And contrariwise, when we speak of one God, one divine substance, we confess that the one God himself, the one divine substance are three persons.
391 3. We believe (and we confess) that only God the Father and Son and Holy Spirit are eternal, and not by any means other things, whether they be called relations or peculiarities or singularities or onenesses, and that other such things belong to God, which are from eternity, which are not God.
392 4. We believe (and confess) that divinity itself, whether you call it divine substance or nature, is incarnate only in the Son.