Full Idea
One actuality always has temporal priority over another, going back to that which always, and in a primary way, initiates process.
Gist of Idea
Actualities are arranged by priority, going back to what initiates process
Source
Aristotle (Metaphysics [c.324 BCE], 1050b05)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.275
A Reaction
I am not clear from the context whether he is referring to things which have fundamental powers, or whether he is referring to the one great First Cause.