Council of Toledo XI, 675

Father. The Son, therefore, is God from the Father; the Father, however, is God, but not from the Son; Father indeed of the Son, not God from the Son. He, however, is Son of the Father and God from the Father. However, the Son is equal in all things to God the Father, because at no time did He either begin or cease to be born. We believe that He is of one substance with the Father, and because of this we say that He is ὁμοούσιος to the Father, that is, of the same substance with the Father, for ὅμος in Greek means one, οὐσία means substance, and the two joined together mean "one substance." For, neither from nothing, nor from any other substance, but from the womb of the Father, that is, from His substance, we must believe that the Son was begotten or born. Therefore, the Father is eternal, and the Son is eternal. But if He always was Father, He always had a Son to whom He was Father; and by reason of this we confess that the Son was born of the Father without beginning. Neither do we call the same Son of God a part of a divided nature because of the fact that He is begotten of the Father; but we assert that the perfect Father begot the perfect Son without diminution or division, because it is a characteristic of Divinity alone not to have an unequal Son. Also, this Son is Son of God by nature, not by adoption,¹ whom we must believe God the Father begot neither by will nor by necessity; for, neither does any necessity happen [al. capit, 'take hold'] in God, nor does will precede wisdom.

277. We believe also that the Holy Spirit, who is the third person in the Trinity, is God, one and equal with God the Father and the Son, of one substance, also of one nature; that He is the Spirit of both, not, however, begotten nor created but proceeding from both. We believe also that this Holy Spirit is neither unbegotten nor begotten, lest if we say unbegotten, we should affirm two Fathers, or if begotten, we should be proven to declare two Sons; He is said to be the Spirit, however, not only of the Father but at the same time of the Father and the Son. For, neither does He proceed from the Father into the Son, nor does He proceed from the Son to sanctify the creature, but He is shown to have proceeded at the same time from both, because He is acknowledged to be the love or holiness of both. Therefore, we believe that this Holy Spirit was sent by both, as the Son was sent by the Father; but He is not considered less than the Father and the Son, as the Son, on account of the body He assumed, testifies that He Himself is less than the Father and the Holy Spirit.

278. This is the account of the Holy Trinity that has been handed down. We must call and believe it to be not triple but triune. Neither can we rightly say that in one God is the Trinity, but that one God is the