Theodoret on Dual Natures of Christ

Wherefore all the human qualities of the Lord Christ, hunger,… and thirst and weariness, sleep, fear, sweat, prayer, and ignorance, and the like, we affirm to belong to our nature which God the Word assumed and united to Himself in effecting our salvation. But the restitution of motion to the maimed, the resurrection of the dead, the supply of loaves, and all the other miracles we believe to be works of the divine power. In this sense I say that the same Lord Christ both suffers and destroys suffering; suffers, that is, as touching the visible, and destroys suffering as touching the ineffably indwelling Godhead. … He is circumcised; He keeps the law; and offers offerings of purification, because He sprang from the root of Jesse. And, as man, He was under the law; and afterwards did away with the law and gave the new covenant, because He was a lawgiver and had promised by the prophets that He Himself would give it. He was baptized by John; and this shews His sharing what is ours. He is testified to by the Father from on high and is pointed out by the Spirit; this proclaims Him eternal. He hungered; but He fed many thousands with five loaves; the latter is divine, the former human. He thirsted and He asked for water; but He was the well of life; the former of His human weakness, the latter of His divine power. He fell asleep in the boat, but he put the tempest of the sea to sleep; the former of His human nature, the latter of His efficient and creative power which has gifted all things with their being. … He feared death and He destroyed death; the former shows that He was mortal, the latter that He was immortal or rather giver of life.

According to the flesh, the Christ was descended from Abraham and David and was of the same nature as theirs; while according to the Godhead He is Everlasting Son and Word of God, ineffably and in superhuman manner begotten of the Father, and co-eternal with Him as brightness and express image and Word. For as the word in relation to intelligence and brightness in relation to light are inseparably connected, so is the only begotten Son in relation to His own Father. We assert therefore that our Lord Jesus Christ is only begotten, and first born Son of God; only begotten both before the incarnation and after the incarnation, but firstborn after being born of the Virgin. For the name first-born seems to be in a sense contrary to that of only begotten, because the only Son begotten of any one is called only begotten, while the eldest of several brothers is called first-born. The divine Scriptures state God the Word alone to have been begotten of the Father; but the only begotten becomes also first-born, by taking our nature of the Virgin, and deigning to call brothers those who have trusted in Him; so that the same is only begotten in that He is God, first born in that He is Man.[1]

The Church, following the footprints of the Apostles, contemplates in the Lord Christ both perfect Godhead and perfect manhood. For just as He took a body, not that He needed a body, but by its means to give immortality to all bodies; so too He took a soul, the guide of the body, that every soul by its means might share His immutability. For even if souls are immortal, they are not however immutable; for they undergo many and frequent changes, as they experience pleasure, now from one object, and now from another. Whence it cometh about that we err when we are changed and are inclined to what is worse. But after the resurrection our bodies enjoy immortality and incorruptibility, and our souls impassibility and immutability. For this reason the only begotten Son of God took both a body and a soul, preserved them free from all blame, and offered the sacrifice for the race. And this is why He is called our high priest; and He is named high priest not as God but as man. He makes the offering as man, and accepts the sacrifice with the Father and the Holy Spirit as God.[2]

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