What is the Hypostatic Union? The English adjective hypostatic comes from the Greek word hypostasis. The word only appears four times in the New Testament. The words Hypostatic union may sound fancy in English, but it’s a pretty simple term. Hypostatic means personal. The hypostatic union is the personal union of Jesus’ two natures.
Jesus has two complete natures—one fully human and one fully divine. What the doctrine of the hypostatic union teaches is that these two natures are united in one person in the God-man. Jesus is not two persons. He is one person. The hypostatic union is the joining of the divine and the human in the one person of Jesus.