Intellectual growth does not collapse from ignorance but from certainty; the real danger begins when individuals and institutions believe their models are complete, their expertise sufficient, and their domains stable. Sustainable intelligence requires a deliberate shift from knowledge ownership to disciplined inquiry—measuring the mind not by the speed of answers but by the depth, precision, and courage of its questions. Through assumption audits, disconfirmation rituals, cross-domain exploration, and organizational cultures that reward inquiry over performance theater, cognitive flexibility becomes a daily practice rather than an abstract virtue. In a volatile, rapidly evolving world, curiosity is not a personality trait or decorative habit; it is an evolutionary necessity, the engine of adaptation, innovation, and long-term relevance.