Full Idea
Many people are comfortable taking the pragmatic approach to night/day, living/nonliving and mammal/premammal, but get anxious about the same attitude to having a self and not having a self. It must be All or Nothing, and One to a Customer.
Gist of Idea
People accept blurred boundaries in many things, but insist self is All or Nothing
Source
Daniel C. Dennett (Consciousness Explained [1991], 13.2)
Book Reference
Dennett,Daniel C.: 'Consciousness Explained' [Penguin 1993], p.422
A Reaction
Personally I think I believe in the existence of the self, but I also agree with Dennett. I greatly admire his campaign against All or Nothing thinking, which is a relic from an earlier age. A partial self could result from infancy or brain damage.