Full Idea
A cerebral habit of the highest kind, which will determine what we do in fancy as well as what we do in action, is called a 'belief'.
Gist of Idea
A 'belief' is a habit which determines how our imagination and actions proceed
Source
Charles Sanders Peirce (What is a Leading Principle? [1880], I)
Book Reference
Peirce,Charles Sanders: 'Philosophical Writings of Peirce', ed/tr. Buchler,Justus [Dover 1940], p.130