Selected quotation
"Imagination is a licensed trespasser: it has no fear of dogs, but may climb over walls and peep in at windows with impunity."
~ George Eliot, "Adam Bede"
Various books with quotations, aphorisms and proverbs:
Great Quotes from Great Leaders
America's Popular Sayings: Over 1600 Expressions on Topics from Beauty to Money and Everything In Between
Everyday Positive Thinking
Bartlett's Familiar Quotations: A Collection of Passages, Phrases, and Proverbs Traced to Their Sources in Ancient and Modern Literature (17th Edition)
Doonesbury.com's The War in Quotes
The Yale Book of Quotations
The Proverbs Driven Life: Timeless Wisdom for Your Words, Work, Wealth, and Relationships
The Book of Positive Quotations, 2nd Edition
Ancient Wisdom: The Book of Proverbs With Devotions for Today
Offerings: Buddhist Wisdom for Every Day (Offerings for Humanity)
Best Quotations for All Occasions
The Wise and Witty Quote Book: More than 2000 Quotes to Enlighten, Encourage, and Enjoy