Selected quotation
"Facts are generally overesteemed. For most practical purposes, a thing is what men think it is. When they judged the earth flat, it was flat. As long as men thought slavery tolerable, tolerable it was. We live down here among shadows, shadows among shadows."
~ John Updike, "Buchanan Dying"
Various books with quotations, aphorisms and proverbs:
The Book of Positive Quotations, 2nd Edition
The Most Brilliant Thoughts of All Time (In Two Lines or Less)
A Continual Feast: Words of Comfort and Celebration, Collected by Father Tim
Apronisms: Pocket Wisdom for Every Day
Great Quotes from Great Leaders
101 French Proverbs
365 Inspirational Quotes (365 Days Perpetual Calendars)
The Yale Book of Quotations
Doonesbury.com's The War in Quotes
The Wise and Witty Quote Book: More than 2000 Quotes to Enlighten, Encourage, and Enjoy
Offerings: Buddhist Wisdom for Every Day (Offerings for Humanity)
Bartlett's Familiar Quotations: A Collection of Passages, Phrases, and Proverbs Traced to Their Sources in Ancient and Modern Literature (17th Edition)