Full Idea
Perhaps the necessary and non-necessary are first principles of everything's either being or not being.
Gist of Idea
Maybe necessity and non-necessity are the first principles of ontology
Source
Aristotle (On Interpretation [c.330 BCE], 23a18)
Book Reference
Aristotle: 'Categories and De Interpretatione', ed/tr. Ackrill,J.R. [OUP 1963], p.64