Hypostatic Union

 Hypostatic union (from the Greek word hypostasis, meaning "person, subsistence") is a technical term in Christian theology employed in mainstream Christology to describe the union of Christ's humanity and divinity in one hypostasis or individual personhood.

The most basic explanation for the hypostatic union is Jesus Christ being both fully God and fully man. He is both perfectly divine and perfectly human and has two complete distinct nature at once.

The Athanasian Creed recognized this doctrine and affirmed its importance by saying, "He is God from the essence of the Father, begotten before time; and he is human from the essence of his mother, born in time; completely God, completely human, with a rational soul and human flesh; equal to the Father as regards to divinity, less than the Father as regards humanity. Although he is God and human, yet Christ is not two, but one. He is one, however, not by his divinity being turned into human flesh, but by God's taking humanity to himself. He is one, certainly not by blending his essence, but by the unity of his person. For just as one human is both rational soul and flesh, so too the one Christ is both God and human."

The Greek term hypostasis had come into use as a technical term prior to the Christological debates of the late fourth and fifth centuries. In pre-Christian times, Greek philosophy (Stoicism) used the word. Some occurences of the term hypostasis in the New Testament foreshadow the later, technical understanding of the word. Although it can translate literally as "substance," this has been a cause of some confusion; accordingly the New American Standard Bible translates it as "subsistence." Hypostasis denotes an actual, concrete existence, in contrast to abstract categories such as the Platonic ideas.

In Kierkegaard's Philosophical Fragments, the dual nature of Christ is explored as a paradox, i.e., as "the ultimate paradox," because God, understood as a perfectly good, perfectly wise, perfectly powerful being, fully became a human, in the Christian understanding of the term: burdened by sin, limited in goodness, knowledge, and understanding. This paradox can only be resolved, Kierkegaard's believed, by a leap of faith away from one's understanding and reason towards belief in God.

As the precise nature of this union is held to defy finite human comprehension, the hypostatic union is also referred to by the alternative term "mystical union."

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