Hypostatic union (from the Greek: ὑπόστασις hypóstasis, 'person, subsistence') is a technical term in Christian theology employed in mainstream Christology to describe the union of Christ's human nature and divine nature in one composed hypostasis, or individual personhood.
In the most basic terms, the concept of hypostatic union states that Jesus Christ is both fully God and fully man. He is simultaneously perfectly divine and perfectly human, having two complete and distinct natures at once.
Theotokos (Koine Greek: Θεοτόκος) is a title of Mary, mother of Jesus, used especially in Eastern Christianity. The usual Latin translations are Dei Genitrix or Deipara (approximately "parent [fem] of God"). Common English translations are "Mother of God" or "God-bearer" – but these both have different literal equivalents in Ancient Greek: Μήτηρ Θεοῦ, and Θεοφόρος respectively.
The title has been in use since the 3rd century, and in the Liturgy of Saint James (4th century). The Council of Ephesus in AD 431 decreed that Mary is the Theotokos because her son Jesus is both God and man: one divine person from two natures (divine and human) intimately and hypostatically united.
Incarnation literally means embodied in flesh or taking on flesh. It is the conception and the embodiment of a deity or spirit in some earthly form or an anthropomorphic form of a god. It is used to mean a god, deity, or Divine Being in human or animal form on Earth. The proper noun, Incarnation, refers to the union of divinity with humanity in Jesus Christ. In Islamic literature it is called "ḥulūl".
Chalcedonian Christianity is the branch of Christianity that accepts and upholds theological resolutions of the Council of Chalcedon, the fourth ecumenical council, held in AD 451. Chalcedonian Christianity accepts the Christological Definition of Chalcedon, a Christian doctrine concerning the union of two natures (divine and human) in one hypostasis of Jesus Christ, who is thus acknowledged as a single person (prosopon). Chalcedonian Christianity also accepts the Chalcedonian confirmation of the Niceno-Constantinopolitan Creed, thus acknowledging the commitment of Chalcedonism to Nicene Christianity.
Chalcedonian Christology is upheld by Roman Catholicism, Eastern Orthodoxy, Lutheranism, Anglicanism and Calvinism (Reformed Christianity), thus comprising the overwhelming majority of Christianity.
In Christianity, God is the eternal, supreme being who created and preserves all things. Christians believe in a monotheistic conception of God, which is both transcendent (wholly independent of, and removed from, the material universe) and immanent (involved in the material universe). Christians believe in a singular God that exists in a Trinity, which consists of three Persons: God the Father, God the Son, and God the Holy Spirit. Christian teachings on the transcendence, immanence, and involvement of God in the world and his love for humanity exclude the belief that God is of the same substance as the created universe (rejection of pantheism) but accept that God the Son assumed hypostatically united human nature, thus becoming man in a unique event known as "the Incarnation".
Early Christian views of God were expressed in the Pauline epistles and the early Christian creeds, which proclaimed one God and the divinity of Jesus. Although some early sects of Christianity, such as the Jewish-Christian Ebionites, protested against the deification of Jesus, the concept of Jesus being one with God was accepted by the majority of Gentile Christians. This formed one aspect of the split of early Christianity and Judaism, as Gentile Christian views of God began to diverge from the traditional Jewish teachings of the time.
God-man (Koine Greek: θεάνθρωπος, romanized: theánthropos; Latin: deus homo) is a term which refers to the incarnation and the hypostatic union of Christ, which are two of mainstream Christianity's most widely accepted and revered christological doctrines.
"Jesus is Lord" (Greek: Κύριος Ἰησοῦς, romanized: Kýrios Iēsoûs) is the shortest credal affirmation found in the New Testament, one of several slightly more elaborate variations. It serves as a statement of faith for the majority of Christians who regard Jesus as both truly man and God. It is the motto of the World Council of Churches.
Dyophysitism (/daɪˈɒfɪsaɪtɪzəm/; from Greek δύο dyo, "two" and φύσις physis, "nature") is the Christological position that Jesus Christ is in two distinct, inseparable natures: divine and human. It is accepted by the majority of Christian denominations, including the Catholic Church, Eastern Orthodox Church, Church of the East, Anglicanism, Methodism, Reformed Christianity and Lutheranism. It is rejected by the Oriental Orthodox churches, who hold to Miaphysitism—that Jesus Christ is of two natures united into one composite nature—while rejecting Monophysitism as heresy along with other extant denominations.
Those who subscribe to the "two natures after the union" formula on either Chalcedonian and Nestorian side were referred to as dyophysites (/daɪˈɒfəsaɪts/). It is related to the doctrine of the hypostatic union and prosopic union.
Nestorius of Constantinople (/ˌnɛsˈtɔːriəs/; Ancient Greek: Νεστόριος; c. 386 – c. 451) was an early Christian prelate who served as Archbishop of Constantinople from 10 April 428 to 11 July 431. He was a Christian theologian from the Catechetical School of Antioch, and several of his teachings in the fields of Christology and Mariology were seen as controversial and heretical, causing major disputes. In 431, he was condemned and deposed from his see by the Council of Ephesus, presided over by his archrival Cyril of Alexandria, but the counter-council led by John I of Antioch vindicated him and deposed Cyril in return. Nestorius refrained from attending both of these councils and instead sought retirement from the Byzantine Emperor.
Nestorius himself used the title Theotokos and did not advocate for its ban. His teachings included cautious usage of Theotokos ("God-Bearer"), used for Mary, mother of Jesus, in order that Christ's human and divine natures not be confused, as he believed Christ was born according to his humanity and not his divinity, which indicated his preference for the concept of the prosopic union of two natures (divine and human) of Christ, over the concept of a hypostatic union. He proposed instead the title of Christotokos ("Christ-bearer"). This brought him into conflict with Cyril of Alexandria and other prominent diophysite and miaphysite churchmen of the time, who accused him of heresy.