Full Idea
If you have just heard a loud clap of thunder, you believe what is expressed by 'there has just been a loud clap of thunder' even if no words come into your mind.
Gist of Idea
You can believe the meaning of a sentence without thinking of the words
Source
Bertrand Russell (My Philosophical Development [1959], Ch.13)
Book Reference
Russell,Bertrand: 'My Philosophical Development' [Routledge 1993], p.114
A Reaction
This seems to me important, and accurate. We should not be too mesmerised by language. Animals have beliefs, and this is a nice example of an undeniable non-linguistic human belief.