Modalistic Monarchianism, also known as Modalism or Oneness Christology, is a Christian theology upholding the oneness of God as well as the divinity of Jesus. As a form of Monarchianism, it stands in contrast with Trinitarianism. Followers of Modalistic Monarchianism consider themselves to be strictly monotheistic, similar to Jews and Muslims. Modalists consider God to be absolutely one and believe that He reveals Himself to creation through different "modes" (or "manifestations"), such as the Father, Son, and the Holy Ghost, without limiting His modes or manifestations.[1][2] The term Modalism was first used by Trinitarian scholar Adolf von Harnack, referencing this belief.
In this view, all the Godhead is understood to have dwelt in Jesus from the incarnation as a manifestation of Yahweh of the Old Testament. The terms "Father" and "Son" are then used to describe the distinction between the transcendence of God and the incarnation (God in immanence).[3] Lastly, since God is a spirit, it is held that the Holy Spirit should not be understood as a separate entity but rather to describe God in action.
Modalistic Monarchianism is closely related to Sabellianism and Patripassianism, two ancient theologies condemned as heresy in the Great Church and successive state church of the Roman Empire.[4][5]
The Bible speaks of Father, Son, and Holy Ghost as different manifestations, roles, modes, titles, attributes, relationships to man, or functions of the one God, but it does not refer to Father, Son, and Holy Ghost as three persons, personalities, wills, minds, or Gods. God is the Father of us all and in a unique way the Father of the man Jesus Christ. God manifested Himself in flesh in the person of Jesus Christ, called the Son of God. God is also called the Holy Spirit, which emphasizes His activity in the lives and affairs of mankind. God is not limited to these three manifestations; however, in the glorious revelation of the one God, the New Testament does not deviate from the strict monotheism of the Old Testament. Rather, the Bible presents Jesus as the Father, the Son, and the Holy Ghost. Jesus is not just the manifestation of one of three persons in the Godhead, but He is the incarnation of the Father, the Jehovah of the Old Testament. Truly, in Jesus dwells all the fulness of the Godhead bodily.
Monarchianism holding that Jesus Christ was not a distinct person of the Trinity but was rather one of three successive modes or manifestations of God
Modalistic Monarchianism took exception to the "subordinationism" of some of the Church Fathers and maintained that the names Father and Son were only different designations of the same subject, the one God, who "with reference to the relations in which He had previously stood to the world is called the Father, but in reference to his appearance in humanity is called the Son." It was taught by Praxeas, a priest from Asia Minor, in Rome about 206 and was opposed by Tertullian in the tract Adversus Praxean (c. 213), an important contribution to the doctrine of the Trinity.
In 382 the Council of Rome, with Pope Damasus I presiding, condemned the heresy, stating, "We anathematize those also who follow the error of Sabellius in saying that the same one is both Father and Son" (Tome of Pope Damasus, 2).
The revelations of Father and Son therefore, to Sabellius, belonged to the past, and the Church now was the Church of the Spirit, and after the end of the age, there would just be God, who would be neither Father, Son, nor Spirit. His teaching was rightly condemned by the Church, which understood that it strikes at the very foundations of Christianity.