Selected quotation
"Animals do neither good nor evil. They do as they must do. We may call what they do harmful or useful, but good and evil belong to us, who chose to choose what we do."
~ Ursula K. LeGuin, "The Other Wind"
Various books with quotations, aphorisms and proverbs:
The Wise and Witty Quote Book: More than 2000 Quotes to Enlighten, Encourage, and Enjoy
Everyday Positive Thinking
The Most Brilliant Thoughts of All Time (In Two Lines or Less)
Doonesbury.com's The War in Quotes
Bartlett's Familiar Quotations: A Collection of Passages, Phrases, and Proverbs Traced to Their Sources in Ancient and Modern Literature (17th Edition)
A Continual Feast: Words of Comfort and Celebration, Collected by Father Tim
365 Inspirational Quotes (365 Days Perpetual Calendars)
8,789 Words of Wisdom
Ancient Wisdom: The Book of Proverbs With Devotions for Today
The Ultimate Guide to the Perfect Word: Quotes - Titles - Poetry - Tips - Words
The Oxford Dictionary of Quotations
The Yale Book of Quotations