Eutychianism is a Christological doctrine that emerged in the 5th century, which posits that Christ has only one nature, a divine one, as opposed to the orthodox belief in both a divine and human nature. This view was deemed heretical by the Council of Chalcedon in 451 AD, which upheld the doctrine of the hypostatic union, affirming that Christ is both fully divine and fully human.
A confession of faith is a formal statement of religious beliefs, often used to define the doctrines and practices of a religious community. It serves both as a declaration of faith for adherents and as a tool for instruction, unity, and identity within the community.
The formation of the New Testament Canon was a complex process that spanned several centuries, involving debates over which writings were considered authoritative and inspired. This process was influenced by theological, ecclesiastical, and political factors, ultimately resulting in the 27 books recognized by most Christian traditions today.
Nicene Christianity refers to the Christian tradition that adheres to the Nicene Creed, a statement of faith formulated at the First Council of Nicaea in 325 AD to address the Arian controversy and establish foundational Christian doctrines about the nature of the Trinity. This form of Christianity emphasizes the co-equal divinity of the Father, Son, and Holy Spirit, forming the basis for most mainstream Christian denominations, including Roman Catholicism, Eastern Orthodoxy, and many branches of Protestantism.
The First Council of Constantinople, held in 381 AD, was the second ecumenical council of the Christian Church, convened to address the Arian controversy and further define the doctrine of the Trinity. It resulted in the Niceno-Constantinopolitan Creed, which expanded on the Nicene Creed and affirmed the divinity of the Holy Spirit, reinforcing the orthodox understanding of the Trinity as one essence in three persons.