Full Idea
We must conclude that priority is a modality distinct from that of time or necessity, a modality arising in some way out of the manner in which a collection is constituted from its members.
Gist of Idea
Priority is a modality, arising from collections and members
Source
Michael Potter (Set Theory and Its Philosophy [2004], 03.3)
Book Reference
Potter,Michael: 'Set Theory and Its Philosophy' [OUP 2004], p.39
A Reaction
He is referring to the 'iterative' view of sets, and cites Aristotle 'Metaphysics' 1019a1-4 as background.