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Wellsprings
cosmology

Motion & Change

κίνησις

Not just things moving through space, but every kind of change — growing, ripening, reddening — as something passes from potential to actual.

Kinesis, or motion and change, stands at the heart of Aristotle's Physics as the fundamental feature of the natural world. For Aristotle, motion encompasses far more than simple movement from place to place—it includes growth, decay, alteration in quality, and rotation. Any transition from potential to actuality counts as motion. This concept allows Aristotle to explain why nothing in nature remains static and to construct a comprehensive account of causation and natural processes.

The practical importance of kinesis appears in how Aristotle uses it to understand ordinary experience. When water heats up, when a plant grows, or when an object rolls across a floor, these are all instances of motion—changes in properties, size, or location. By organizing these diverse phenomena under a single concept, Aristotle creates a framework for explaining why the world is dynamic rather than frozen, and how things come to possess new characteristics over time.

Where this idea shows up

78 Greek sources·3 Jewish-canon citations

Where to read it