Full Idea
Soul, being the source of motion, is the most ancient thing there is.
Gist of Idea
Self-moving soul has to be the oldest thing there is
Source
Plato (The Laws [c.349 BCE], 896b)
Book Reference
Plato: 'Complete Works', ed/tr. Cooper,John M. [Hackett 1997], p.1553
A Reaction
Plato seems to assume that the First Mover must still exist, which doesn't follow from anything in the argument. The First Pusher could be dead before the last domino falls. Why can't activity be the default state of everything?