Trying to track down a C S Lewis quote

["Michael Tombs" <Michael.Tombs@tesco.net>]

I'm trying to track down a half-remembered C. S. Lewis quotation,
which goes something like - there can't be a cup of tea too large, or
a book too long.
Any help much appreciated.
Michael Tombs
Michael.Tombs@tesco.net
Writers Daily Quote: a quotation a day about writers and writing
http://michael_tombs.tripod.com/WritersQuotes.html