Catechesis · Inquirer
The Two Natures
Catechesis · Inquirer
The Two Natures
The Council of Chalcedon (451) answered this with careful precision: Jesus Christ is one Person in two natures — divine and human — without confusion, without change, without divi…
Question
How is Jesus both God and man?
The Council of Chalcedon (451) answered this with careful precision: Jesus Christ is one Person in two natures — divine and human — without confusion, without change, without division, and without separation. These four negations are not a definition; they are boundaries. They say what cannot be true, protecting the mystery from distortion without claiming to explain it.
The two natures are not mixed into one. The divine nature remains divine — infinite, impassible, eternal. The human nature remains human — finite, capable of suffering, mortal. They are united in one Person, the eternal Son, who is both. He is the same Person who created the stars and who wept at the tomb of Lazarus.
The teaching
One Person, two natures — the Chalcedonian definition
Before Chalcedon, the Church had fought three major Christological battles. Arianism said the Son was less than fully divine. Apollinarianism said He lacked a human mind. Nestorianism seemed to make two Christs. Each error distorted either Christ's divinity, His humanity, or the unity of His Person. Chalcedon defended all three simultaneously.
After Chalcedon, the Church fought two more. Eutychianism (later Monophysitism) said the two natures merged into one — the human was absorbed by the divine. And Monothelitism said Christ had only one will. The Third Council of Constantinople (681) condemned Monothelitism, adding to the Chalcedonian definition: Christ has two wills and two operations, as well as two natures.
The same one is perfect in divinity and perfect in humanity, truly God and truly man... known in two natures, without confusion, without change, without division, without separation.
This is the Chalcedonian definition. "The same one" — the subject of both natures is the same single Person. "Perfect in divinity and perfect in humanity" — no reduction on either side. The four negations are not concessions; they are protections. They guard the mystery from all four ways it can be distorted.
Council of Chalcedon
Definition of Faith · 451 AD
Holy Scripture
"For in Him the whole fullness of deity dwells bodily."
Colossians 2:9
"For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin."
Hebrews 4:15
Chalcedon and Us
Why the precision of Christology matters for daily life
The Chalcedonian definition might seem like abstract theology. It is not. The precision matters because salvation depends on it. If the divine nature of Christ suffered and changed, then God is not impassible — the foundation of divine reliability and trustworthiness shifts. If the human nature was not real, then our nature was not healed. The precision protects the gospel.