Full Idea
If relativism offers an accurate description of human values, then rhetoric replaces logos as the most fundamental human activity.
Gist of Idea
If relativism is the correct account of human values, then rhetoric is more important than reasoning
Source
David Roochnik (The Tragedy of Reason [1990], p.47)
Book Reference
Roochnik,David: 'The Tragedy of Reason: the Platonic logos' [Routledge 1990], p.47
A Reaction
Or putting it another way, logos (reason) becomes meaningless. I suppose, though, that a relativist can conduct conditional reasoning (but must belief in some rules of reason).