A quotation is a fragment of a human expression that is being referred to by somebody else. Most often an quotation is taken from literature, but also sentences from a speech, scenes from a movie, elements of a painting, etc. may be quoted.
Proverbs and quotations have similar cultural influence. In case of extensive quoting from a work one needs to consider copyright and fair use.
wikipedia.org dumped 2003-03-17 with terodump