Selected quotation
"Our two eyes do not make our lot better; one serves us to see the good things, the other the evils of life. A lot of people have the bad habit of closing the first, and very few close the second."
~ François-Marie Arouet (Voltaire), "The One-Eyed Porter"
Various books with quotations, aphorisms and proverbs:
Doonesbury.com's The War in Quotes
101 French Proverbs
The Ultimate Guide to the Perfect Word: Quotes - Titles - Poetry - Tips - Words
America's Popular Sayings: Over 1600 Expressions on Topics from Beauty to Money and Everything In Between
Bartlett's Familiar Quotations: A Collection of Passages, Phrases, and Proverbs Traced to Their Sources in Ancient and Modern Literature (17th Edition)
The Oxford Dictionary of Quotations
Apronisms: Pocket Wisdom for Every Day
The Book of Positive Quotations, 2nd Edition
The Wise and Witty Quote Book: More than 2000 Quotes to Enlighten, Encourage, and Enjoy
A Continual Feast: Words of Comfort and Celebration, Collected by Father Tim
Chinese Proverbs
Everyday Positive Thinking