Full Idea
The traditional conception of Reason is that all beliefs should be justified (that is, backed up by reasons) in order to be rational.
Gist of Idea
Traditionally, rational beliefs are those which are justified by reasons
Source
Stathis Psillos (Causation and Explanation [2002], §1.6)
Book Reference
Psillos,Stathis: 'Causation and Explanation' [Acumen 2002], p.34
A Reaction
I think it is the duty of all philosophers to either defend this traditional view, or quit philosophy for some other activity. Rorty suggests hermeneutics. In a democracy, rulers should be continually required to give reasons for their decisions.