Proverbs and Phrases 

• Phrase Finder
  "1,700 English phrases, sayings, idioms and expressions, with their meanings and origins explained..."
• Proverbs, Maxims and Phrases of All Ages (1887)
  "The 20,500 selections in this classic reference work comprise an encyclopedic scope of English proverbs as well as translations from every major language."

 Quotations 

• Bartlett's Familiar Quotations (1919)
  "This tenth edition of 1919 contains over 11,000 searchable quotations and was the first new edition of John Bartlett’s corpus to be published after his death in 1905."
• Famous Quotes & Authors
  "Browse over 25,000 quotes online from over 6,700 famous authors."
• LitQuotes
  "If you love literature or quotes this is the place for you! This literary reference site features quotations from the great works of literature."
• Mathematical Quotation Server
  "A collection of mathematical quotations culled from many sources" which can be searched, browsed, or downloaded.
• Misquotes: Searching for Authenticity Online
  "Misquotes often spread virally through social media, highlighting the lack of skepticism by Web users when sharing poorly cited quotes. Students should learn to treat quotes with suspicion, and how to verify questionable quotes prior to use."
• Movie Quotes
  Find movie quotations in the Internet Movie Database.
• Quotations Page
  "You've reached the oldest quotation site on the Web, established 1994. We have over 26,000 quotations online from over 3,100 authors, and more are added daily."
• Quotes.net
  Browse or search for quotes from famous people.
• Respectfully Quoted (1989)
  "The 2,100 entries in this eminently researched collection form the constellation of collected wisdom in American political debate."
• WikiQuote
  "Wikiquote is a free online compendium of sourced quotations from notable people and creative works in every language, translations of non-English quotes, and links to Wikipedia for further information." As with all wikis, be wary of putting too much faith in its accuracy.
• Yale Book of Quotations
  This site does not have quotations itself but rather is a guide to reliable quotation sites on the web.