De Trinitatis erroribus librii vii
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De Trinitatis erroribus libri vii (1531) was a significant work by Michael Servetus, a Spanish physician and theologian. In this book, Servetus challenged the orthodox Christian doctrine of the Trinity. He proposed his own views, suggesting that the Word is an eternal expression of God, while the Spirit is God's power in humans. The Son, in his view, was the union of the eternal Word with Jesus. Both Protestants and Roman Catholics found his teachings heretical, and his unorthodox views ultimately led to his execution by Calvinists in Geneva.12
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