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In philosophy, "essence" refers to the intrinsic nature or indispensable qualities of something, making it what it is. It's the fundamental characteristic that defines an object or concept. Essentialism, an ontological view, posits that certain properties are essential to objects, meaning an object cannot lack these properties and remain the same entity.123

This concept is explored in various philosophical traditions. For instance, in Islamic philosophy, thinkers like Avicenna distinguished between essence and existence, arguing that existence is imparted to an essence by a cause. German idealism, in response to skepticism, sought to restore reason's role in understanding reality, with philosophers like Fichte positing that all being is posited by the ego. Idealism itself, as seen in Berkeley's philosophy, suggests that reality is fundamentally mental, while Hegel's idealism views the universe as constituted by mind or spirit.456

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