People's perception of happiness fundamentally depends on change and contrast. When all needs are instantly satisfied or when one remains in a state of "full capacity" for a long time, the brain quickly adapts, and the feeling of happiness diminishes. This is also why continuous ease and enjoyment often become dull. But this does not mean that "lack of happiness itself is happiness," rather, moderate scarcity, challenges, and delayed gratification make it easier for people to experience a sense of achievement and meaning during effort and goal achievement. What truly makes people feel fulfilled is not just the result, but the complete cycle of "giving—progress—feedback." Therefore, instead of always striving to stay at a high point, it is better to consciously leave space in life: to try new challenges, develop new skills, and keep oneself in a zone where growth is possible. In this way, happiness is not consumed but continually reactivated through rhythm and change.