Full Idea
The soul seems to be universally defined by three features, so to speak, the production of movement, perception and incorporeality.
Clarification
'Soul' is the Greek word 'psuché', which covers mind and consciousness and life
Gist of Idea
Mind involves movement, perception, incorporeality
Source
Aristotle (De Anima [c.329 BCE], 405b12)
Book Reference
Aristotle: 'De Anima (On the Soul)', ed/tr. Lawson-Tancred,H.C. [Penguin 1986], p.136
A Reaction
'Incorporeality' begs the question, but its appearance is a phenomenon that needs explaining. 'Movement' is an interesting Greek view. Nowadays we would presumably added intentional states, and the contents and meaning of thoughts. No 'reason'?