The idea that the final authority in spiritual matters belonged to the whole community of Christians was known as

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The idea that the final authority in spiritual matters belonged to the whole community of Christians, rather than just the Pope or other leaders, is known as conciliarism. This view was popularized in the late Middle Ages and was a response to the growing power and corruption of the papacy. Conciliarism held that Church councils, made up of representatives from all levels of the Church, had the ultimate authority to decide matters of doctrine and faith.

The Idea That the Final Authority in Spiritual Matters Belonged