“Why are there beings at all, and why not rather nothing? That is the question.”
Warum ist überhaupt Seiendes und nicht vielmehr Nichts? Das ist die Frage.
What is Metaphysics? (1929), p. 110
Cf. Gottfried Leibniz, De rerum originatione radicali (1697)ː "cur aliquid potius extiterit quam nihil."
Source: Introduction to Metaphysics