A Beginner's Guide to the Chalcedonian Creed

Most Christians can name the Nicene Creed. Far fewer have heard of the Chalcedonian Creed — yet it answers a question the Nicene Creed left open. Nicaea established that the Son is fully divine, of the same substance as the Father. But once you accept that Jesus Christ is fully God, an urgent question follows: what is his relationship to the human being who walked in Galilee, got hungry and tired, wept at Lazarus's tomb, and died on a Roman cross? The Council of Chalcedon in 451 AD answered that question with a precision that has guided Christian theology ever since.

The Question Chalcedon Was Answering

By the fifth century, two extreme answers to the question of Christ's natures had emerged and spread widely through the church. One position, associated with Nestorius of Constantinople, seemed to result in Christ being two persons — a divine person and a human person joined in a close moral union. On this view, it would be wrong to say that God was born of Mary, or that God suffered on the cross.

The other extreme, associated with a monk named Eutyches, taught the opposite: that Christ's humanity was absorbed into his divinity at the incarnation, producing a single mixed nature — neither fully human nor fully divine. This view is called Monophysitism (from the Greek for 'one nature').

Both positions had serious pastoral and theological consequences. If Christ is two persons, the atonement is complicated: which person died? If Christ's humanity was swallowed up by his divinity, he did not truly share in our human condition — and our salvation through his humanity is undermined.

What Chalcedon Said

The council affirmed that Jesus Christ is one person — not two — in two natures: fully divine and fully human. These two natures are united in one person without being confused (mixed together), changed (one nature transforming the other), divided (split into two persons), or separated (temporarily joined and later apart).

The four adverbs of Chalcedon — inconfusedly, unchangeably, indivisibly, inseparably — have become some of the most important words in Christian theology. Together they rule out both Nestorianism (dividing) and Eutychianism (confusing), while affirming the genuine, permanent, unified humanity and divinity of the one Christ.

Why It Still Matters

Chalcedonian Christology is not theological trivia. It is the framework that makes sense of the whole New Testament. When Jesus prays to the Father, it is the human nature praying through the one person of the Son. When he forgives sins and raises the dead, it is the divine nature acting through that same one person. When he suffers and dies, God himself has truly entered into human death — not by abandoning his divinity, but by assuming humanity into the divine person of the Son.

Chalcedon is accepted by Roman Catholics, Eastern Orthodox, and virtually all Protestant traditions. It is one of the broadest points of consensus in all of Christianity. To understand it is to understand the heart of what the church has always believed about Jesus Christ.