Council of Toledo XI, 675

however, according as He is God created Mary, according as He is man was created from Mary; He is both father and son of His mother Mary. Likewise by the fact that He is God, He is equal to the Father; by the fact that He is man, He is less than the Father. Likewise we must believe that He is both greater and less than Himself; for in the form of God even the Son Himself is greater than Himself on account of the humanity He assumed, than which the divinity is greater; in the form, however, of a servant He is less than Himself, that is, in His humanity, which is recognized as less than His divinity. For, as by reason of the body which He assumed He is believed to be not only less than the Father but also less than Himself, so according to His divinity He is coequal with the Father, and both He and the Father are greater than man, which the person of the Son alone assumed. Likewise to the question whether the Son could so be equal to and less than the Holy Spirit, as we believe that He is now equal to, now less than the Father, we reply: According to the form of God He is equal to the Father and to the Holy Spirit, according to the form of a servant, He is less than both the Father and the Holy Spirit; because neither the Holy Spirit nor the Father, but only the person of the Son assumed a body, by which He is believed to be less than those two persons. Likewise we believe that this Son, inseparable from God the Father and the Holy Spirit, is distinguished from them by His person, and distinguished from other men by the nature He assumed [another version, from the manhood assumed]. Likewise with reference to man it is His person that is preeminent; but with reference to the Father and the Holy Spirit it is the divine nature or substance. Yet we must believe that the Son was sent not only by the Father but also by the Holy Spirit; because He himself said through the prophet And now the Lord has sent me and His Holy Spirit [Isa. 48:16]. We believe also that He was sent by Himself, because we acknowledge that not only the will but also the works of the whole Trinity are inseparable. For, He who before all ages was called the only begotten, in time became the first born; the only begotten on account of the substance of the Godhead, the first born on account of the nature of the body which He assumed.

286. [The Redemption] In this form of assumed human nature we believe according to the truth of the Gospels that He was conceived without sin, born without sin, and died without sin, who alone for us became sin [II Cor. 5:21], that is, a sacrifice for our sin. And yet He endured His passion without detriment to His divinity, for our sins, and condemned to death and to the cross, He accepted the true death of the body; also on the third day, restored by His own power, He arose from the grave.

287. In this example, therefore, of our Head we confess is accomplished