Full Idea
The 'principled' (Kantian) sense of rationality means the possession of a capacity for generating or recognizing necessary truths, a priori beliefs, strictly universal normative rules, nonconsequentialist moral obligations, and categorical 'ought' claims.
Gist of Idea
Kantian principled rationality is recognition of a priori universal truths
Source
Robert Hanna (Rationality and Logic [2006], Intro)
Book Reference
Hanna,Robert: 'Rationality and Logic' [MIT 2006], p.-6