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The principle attributed to the Greek philosopher Heraclitus (?535–?475bc) according to which everything eventually changes into its opposite. In analytical psychology, Carl Gustav Jung (1875–1961) described it as ‘the principle which governs all cycles of natural life, from the smallest to the greatest’ (Collected Works, 7, paragraph 112). [From Greek enantios opposite + dromos course + -ia indicating a condition or quality]

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