Full Idea
Constraints of rationality are built into the structure of mind and language, specifically into the structure of intentionality and speech acts.
Clarification
'Intentionality' is the capacity to think ABOUT things, to have meaning
Gist of Idea
Rationality is built into the intentionality of the mind, and its means of expression
Source
John Searle (Rationality in Action [2001], Int xiv)
Book Reference
Searle,John R.: 'Rationality in Action' [MIT 2001], p.-3