Letter 35: 1. Eutyches' heresy involves many other heresies. Leo, bishop of the city of Rome to his well-beloved brother, Julian the bishop.

Pope Leo the GreatJulian of Antioch|c. 444 AD|leo great
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Leo, Bishop of the City of Rome, to his beloved brother Julian, Bishop of Cos.

I. The heresy of Eutyches involves many other heresies

Although, through our brothers whom we dispatched from Rome on behalf of the faith, we have already sent a most thorough refutation of Eutyches' extreme heresy to our brother Flavian, nevertheless -- because we have received your letter through our son Basil, beloved, and it has given us great satisfaction by the fervor of its Catholic spirit -- we have added this further letter, which is in full agreement with the earlier document. We urge you to offer a united and vigorous resistance to those who seek to corrupt the gospel of Christ, for the wisdom and teaching of the Holy Spirit is one and the same in you as in us. Whoever does not receive this teaching is not a member of Christ's body and cannot glory in that Head in which he denies the presence of his own nature.

What advantage does that most unwise old man gain by attacking the faith of believers under the banner of opposing Nestorianism? By declaring that the only-begotten Son of God was so born of the blessed Virgin's womb that He wore the mere appearance of a human body without the reality of human flesh being united to the Word, Eutyches departs just as far from the true path as Nestorius did in separating the Godhead of the Word from the substance of the humanity He assumed.

From this monstrous falsehood, who cannot see what other monstrous errors spring? For whoever denies the true humanity of Jesus Christ is inevitably filled with many blasphemies -- claimed by Apollinaris as his own, seized upon by Valentinus, or held fast by the Manichaeans, none of whom believed that there was true human flesh in Christ. But if that truth is not accepted, then it is denied not only that He who was in the form of God took the form of a servant and was born as man with a reasonable soul, but also that He was crucified, died, was buried, and on the third day rose again, and that, seated at the right hand of the Father, He will come to judge the living and the dead in the same body in which He was judged -- for all these pledges of our redemption are rendered void if Christ is not believed to possess the true and complete nature of true humanity.

II. Both natures are to be found in Christ

Because the signs of His divinity were undeniable, shall the proof of His having a human body therefore be regarded as false? Shall the evidence of both natures be admitted to prove Him Creator, but not accepted for the salvation of the creature? No -- for the flesh did not diminish what belongs to His divinity, nor did His divinity destroy what belongs to His flesh. He is at once eternal from His Father and temporal from His mother, inviolable in His strength and subject to suffering in our weakness. In the unity of the Godhead He is of one and the same substance with the Father and the Holy Spirit, but in taking humanity upon Himself He is not of one substance with us in respect of His divinity, but of one substance with us in respect of His humanity.

For He took upon Himself the whole of our nature so that He might heal the whole of it, since the purpose of the Incarnation was the restoration of the entire human person. Those who deny any element of His true human nature consequently deny the reality of our redemption. We urge you, therefore, brother, to stand firm in this faith and to resist all who would corrupt it, whether they deny His divinity like the Arians or His humanity like Eutyches, for the whole mystery of our salvation depends upon the truth of both natures united in one Person.

Dated from Rome.

Modern English rendering for readability. See the 19th-century translation or original Latin/Greek for scholarly use.

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