Full Idea
Maybe some of your beliefs are inferred 'online' from what you have in your files, along with your inferential rules. 'Shakespeare didn't have a telephone' is a classic example, which we infer if the occasion arises.
Gist of Idea
Some beliefs are only inferred when needed, like 'Shakespeare had not telephone'
Source
Jerry A. Fodor (LOT 2 [2008], Ch.3 App)
Book Reference
Fodor,Jerry A.: 'LOT 2: the Language of Thought Revisited' [OUP 2008], p.97
A Reaction
A highly persuasive example. There seem to be a huge swathe of blatantly obvious beliefs (especially negative ones) which may never cross our minds during an entire lifetime, but to which we certainly subscribe.