Full Idea
Quine argues that no necessity can be known other than empirically.
Gist of Idea
For Quine the only way to know a necessity is empirically
Source
report of Willard Quine (works [1961]) by Jonathan Dancy - Intro to Contemporary Epistemology 14.6
Book Reference
Dancy,Jonathan: 'Introduction to Contemporary Epistemology' [Blackwell 1985], p.222