Arianism, Gnosticism, Pelagianism, Marcionism — and the councils that answered them. Every major heresy forced the Church to speak with greater precision. These are the controversies that produced orthodoxy.
A curated path through films, essays, sacred art, and primary sources connected to this doctrine. Begin with the featured study, then move deeper through related articles and archive entries.
2026-05-17The Eucharist is the most thoroughly attested practice of the earliest Church — and the single sacrament that has done the most to keep Christians apart. The reason is not pettiness. It is Christology.
2026-05-15Montanus claimed the Holy Spirit was speaking through him with a new and final revelation that completed what the apostles had left unfinished. The Church's rejection of his movement defined something essential about how Christian authority works.
2026-05-14Pelagianism is the theology of human capability. Augustine's response is still the most precise account of grace, sin, and freedom that Christian theology has produced.
2026-05-14Marcion of Sinope believed the God of the Old Testament was a different — and lesser — deity than the Father of Jesus Christ. His solution was a Bible without the Old Testament.
2026-05-13Gnosticism offered a Jesus who escaped the material world. Irenaeus spent twenty years explaining why that Jesus cannot save anyone.
Arianism was not a fringe position. For decades it controlled the Church's institutions, filled the episcopal sees, and nearly became Christianity's permanent confession.