Selected quotation

"Of all the animals, man is the only one that is cruel. He is the only one that inflicts pain for the pleasure of doing it."

~ Mark Twain



Various books with quotations, aphorisms and proverbs:

The Oxford Dictionary of Quotations

Oxymoronica: Paradoxical Wit & Wisdom From History's Greatest Wordsmiths

Doonesbury.com's The War in Quotes

Apronisms: Pocket Wisdom for Every Day

The Wise and Witty Quote Book: More than 2000 Quotes to Enlighten, Encourage, and Enjoy

Bartlett's Familiar Quotations: A Collection of Passages, Phrases, and Proverbs Traced to Their Sources in Ancient and Modern Literature (17th Edition)

Positive Thinking Every Day: An Inspiration for Each Day of the Year

Everyday Positive Thinking

Chinese Proverbs

Great Quotes from Great Leaders

The Book of Positive Quotations, 2nd Edition

101 French Proverbs