Do you ever find yourself searching for the right quote and tried to find it via search engines? It can be really frustrating.
One easier way is to use Bill Austin's Famous Quotes site - http://quotes.wordpress.com/. It's a slightly idiosyncratic site drawing quotes from a variety of sources.
Quotes are filed under a variety of topic headings, making it easier to find quotes for particular purposes or, if bored, simply to surf.