This work by the Irish churchman, John Scotus Eriugena, discusses the foundational principles of philosophy as a means to explore and understand true religion, asserting that true philosophy is inherently linked to true religion. It highlights the necessity of using philosophical methods-divisoria, definitiva, demonstrativa, and resolutiva-to address and refute heretical beliefs, particularly those propagated by figures like Gotescalcus. The author argues for the importance of being well-prepared in defending the truth against falsehoods, suggesting that heresies can paradoxically serve to awaken the faithful and encourage a deeper pursuit of truth within the Catholic Church

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