Hegel’s concept of reflection-in-itself is the key to understanding how Essence differs from mere Being. While Being is immediate and fleeting, Essence is self-mediating—it negates immediacy, repels itself outward, and returns inward, sustaining identity through difference. This dynamic identity is not static sameness but a process of self-relation.

Hegel illustrates this with the optical analogy of light: a ray strikes a surface and is reflected back, just as Essence gathers scattered elements into a coherent whole. Reflection-in-itself is inseparable from reflection-into-another, since appearance is always the essence’s own appearance, folded back into itself.

Historically, Hegel builds on Kant and Schelling. Kant showed that knowledge is structured by categories but left a dualism between phenomena and noumena. Schelling emphasized unity in nature. Hegel advances further by showing unity as a logical process of negation and mediation.

Applied to psychology, reflection-in-itself explains how a soul differs from a mere bundle of sensations: the soul reflects sensations into a center, creating self-awareness. In modern systems theory, the idea resonates with feedback loops, where systems sustain themselves by reflecting inputs back into their structure.

Ultimately, reflection-in-itself reveals identity as dynamic self-relation, where difference is integrated rather than erased. It is the rhythm by which Being becomes Essence, and Essence becomes the ground of subjectivity, with implications for philosophy, psychology, and systems thinking.

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"Dare to use your own reason" - Immanuel Kant