Rhythm (n.) was given by the Muses because most of us have lost all sense of measure and lack grace.
Rhythm (n.) is motion of the body measured by number — the same discovery as musical intervals, made in the dance.
Rhythm (n.) and harmony are needed by the whole of human life, which is why lyre lessons are drilled into children's souls to make them gentler.
Rhythm (n.) and harmony are the gods' gift to us alone: young animals all leap and shriek, but only humans feel order and disorder in movement and enjoy them.
Rhythm (n.) is the organizing function of the mind, as such, the body is to be developed by graceful rhythms of physical activity and the mind is to be developed by graceful rhythms of thought.