The highest heaven in medieval Christian theology; the realm of pure divine fire or essence.
From Latin 'empyreum,' derived from Greek 'empyros' (fiery). This specific term became standardized in Christian theological texts to denote the highest celestial sphere beyond the visible cosmos.
Empyreum represents medieval theology's attempt to explain how something immaterial (God, divinity, pure essence) could exist—they used 'fire' as a metaphor for something intensely pure and alive, which reveals how pre-scientific people imagined the abstract.
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