Full Idea
Although unfalsifiability is probably a defect in scientific hypothesis, because it is deprived of empirical content, it seems rather to be a virtue in a metaphysical hypothesis.
Gist of Idea
Unfalsifiability may be a failure in an empirical theory, but it is a virtue in metaphysics
Source
E.J. Lowe (A Survey of Metaphysics [2002], p.241)
Book Reference
Lowe,E.J.: 'A Survey of Metaphysics' [OUP 2002], p.241
A Reaction
Presumably nothing could ever be found to count against a necessary truth. A nice point. 'Find me an instance where 2+2 is not 4'.