Abstract
The theses of this paper are that: 1. the attempt to found absolute norms on rationality presupposes the availability of a single universal absolute conception of rationality, but no such conception is available; and 2. any conception of rationality which might be available for justifying one's ultimate normative commitments is itself evaluative. “Rationality” itself is a value-laden concept, as are all its philosophical sub-divisions—logic, ethics, aesthetics, axiology, etc. Choosing ultimate value principles under conditions of freedom, enlightenment, and impartiality presupposes that one positively values such things. Rationality is an inescapably evaluative concept, not a value neutral concept.