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A philosophical system favoured by certain Catholic philosophers in the 19th cent. The ontologists asserted that God Himself is the guarantee of the validity of human ideas; that all human knowledge, itself a mode of truth, implies an immediate intuition of uncreated Truth; and that the idea of being, which is the first and simplest idea of all, is an immediate perception of absolute Being. A set of seven ‘Errores Ontologistarum’ was condemned by the Inquisition in 1861.

Subjects: Christianity.

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