Mark Schreiner

This paper develops a novel defense of the Principle of Sufficient Reason (PSR) by deriving it from the Parmenidean axiom, ex nihilo nihil fit (ENNF). Its central innovation is the Equivalence Thesis, which argues that synchronic brute facts instantiate the same ontological arbitrariness as diachronic creation from nothing. On this view, brute facts are violations of the Parmenidean prohibition, and the PSR follows as a necessary consequence of this more fundamental principle rather than standing as an independent axiom. The paper develops this argument through detailed engagement with contemporary defenses of brute fundamentality and challenges from grounding theory.