Full Idea
The two themes permeating the philosophical literature are that rationality is a matter of reasons, or that rationality is a matter of reliability.
Gist of Idea
Rationality is normally said to concern either giving reasons, or reliability
Source
Robert Nozick (The Nature of Rationality [1993], p.64)
A Reaction
Since a clock can be reliable, I would have thought it concerns reasons. Or an unthinking person could reliably recite truths from memory. There is also the instrumental view of rationality.
Book Reference
Nozick,Robert: 'The Nature of Rationality' [Princeton 1995], p.64
Related Idea
Idea 22662 In the instrumental view of rationality it only concerns means, and not ends [Nozick]