Full Idea
Theories function as links in the causal chains that run from environmental outcomes to the beliefs that they cause the inquirer to have.
Gist of Idea
Theories are links in the causal chain between the environment and our beliefs
Source
Jerry A. Fodor (The Elm and the Expert [1993], §4)
Book Reference
Fodor,Jerry A.: 'The Elm and the Expert' [MIT 1995], p.97