Bartleby.com is an excellent place to get quotations, thesaurus entries, English usage tips, and more. Find political debate quotes, Indexes by Author, Subject & Title, The Oxford Shakespeare, Daily Definitions, and Bartlett's Familiar Quotations.
Amazingly, it's all free.
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Yes, Bartleby is great, but don't forget that your public library probably offers free online encyclopedias (without ads) you can use from home if you have a library card. Either google the name of your local library, or look it up on publiclibraries.com