Soul (ψυχή) often equated with life-force or breath.

"all things are full of gods" Aristotle, De Anima 411a7, quoting Thales

Heraclitus: the soul has a deep, unexplored structure and needs to be “kindled” like fire to become wise

Pythagoreans: soul is immortal and transmigrates (metempsychosis).

Empedocles and Anaxagoras introduce NOUS (mind) as a soul-like power.

No strict separation yet between physical and spiritual dimensions.