Full Idea
What can there be in my mind that I make use of when I follow a general rule to add in the future? It seems that the entire idea of meaning vanishes into thin air.
Gist of Idea
If you ask what is in your mind for following the addition rule, meaning just seems to vanish
Source
Saul A. Kripke (Wittgenstein on Rules and Private Language [1982], 2)
Book Reference
Kripke,Saul: 'Wittgenstein on Rules and Private Language' [Blackwell 1993], p.22
A Reaction
Introspection probably isn't the best way to investigate the phenomenon of meaning. Indeed it seems rather old-fashioned and Cartesian. Kripke says, though, that seeking 'tacit' rules is even worse [end of note 22].