Full Idea
Since conceivability is the chief method of assessing the claims of metaphysical necessity, I think such claims are incautious.
Gist of Idea
If claims of metaphysical necessity are based on conceivability, we should be cautious
Source
Gabriel M.A. Segal (A Slim Book about Narrow Content [2000], 1.6)
Book Reference
Segal,Gabriel M.A.: 'A Slim Book about Narrow Content' [MIT 2000], p.16