Full Idea
The terminology of "propositional attitudes" is confused, because it suggests that a belief is an attitude towards a propositions, …but the proposition is the content, not the object, of my belief.
Gist of Idea
Our beliefs are about things, not propositions (which are the content of the belief)
Source
John Searle (Rationality in Action [2001], Ch.2)
Book Reference
Searle,John R.: 'Rationality in Action' [MIT 2001], p.36