Full Idea
The three main threats to our rational lives are fear of inconsistency, illusions (of absolutism and relativism) and doubt.
Gist of Idea
Rationality is threatened by fear of inconsistency, illusions of absolutes or relativism, and doubt
Source
Robert Fogelin (Walking the Tightrope of Reason [2003], Ch.4)
Book Reference
Fogelin,Robert: 'Walking the Tightrope of Reason' [OUP 2004], p.96
A Reaction
This is a very nice analysis of the forces that can destroy the philosopher's aspiration to the rational life. Personally I still suffer from a few illusions about the possibility of absolutes, but I may grow out of it. The other three don't bother me.