It appears in "Old Times on the Mississippi" ("Perplexing Lessons") and 
the quote reads:  "How do you follow a hall at home in the dark? Because 
you know the shape of it. You can't see it."

Joe Csicsila

Michael Kiskis wrote:
> A little help. =20
> =20
> I received a note from a local teacher who is working on a curriculum on
> Mark Twain for the 4th and 5th grades.  She emailed me the note below
> looking for help to identify the quote.  I admit that I can't recall
> where it (or if it) appears in any Twain work.
> =20
> If anyone has some idea, please let me know.  And I will pass the
> response along.
> =20
> Thanks very much.
> =20
> ____________________________________________
> Michael J. Kiskis
> Leonard Tydings Grant Professor of American Literature
> Elmira College
> One Park Place
> Elmira, NY  14901
> 607-735-1827
> =20
> =20
> I have been unable to find the Twain quote that I was asking about last
> night.  I'll  just paraphrase it and hope that someone out there will
> recognize it and be able to relay it back as the author intended it to
> be. I really appreciate your help.=20
> =20
> '  Like walking a hallway in the dark-- you've done it a hundred times
> before, with nothing but bare feet and faith. '
>