The creeds did not create early Christian orthodoxy but crystallized it: they were summaries of the apostolic faith already believed and practiced, forged under pressure from specific theological controversies rather than constructed from scratch. Athanasius used creedal confession of Christ's preexistence and incarnation as the standard against Arian subordinationism; Tertullian barred heretics from scriptural debate on the grounds that they lacked creedal possession of the apostolic tradition; and Vincent of Lérins defined the rule of orthodoxy as what had been believed in accordance with antiquity, universality, and consent — with creeds embodying that consensual standard. Conciliar anathemas gave creeds institutional teeth, imposing deposition or excommunication on those who set aside synodal creedal definitions.
Presents the creedal confession of the Son's preexistence and incarnation — "who existed before all ages, and was with the Father who had begotten Him... and remaineth King and God unto all ages" — as the Trinitarian norm that exposes and excludes Arian subordinationism.
Scripture must be interpreted in accordance with the tradition of the Catholic Church, guided by antiquity, universality, and consent — creeds embody this consensual rule, serving as the antidote against novel doctrinal poisons concealed under appeal to Scripture.
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