Selected quotation
"Let the punishments of criminals be useful. A hanged man is good for nothing; a man condemned to public works still serves the country, and is a living lesson."
~ François-Marie Arouet (Voltaire), "Philosophical Dictionary"
Various books with quotations, aphorisms and proverbs:
A Continual Feast: Words of Comfort and Celebration, Collected by Father Tim
8,789 Words of Wisdom
365 Inspirational Quotes (365 Days Perpetual Calendars)
The Proverbs Driven Life: Timeless Wisdom for Your Words, Work, Wealth, and Relationships
The Book of Positive Quotations, 2nd Edition
Positive Thinking Every Day: An Inspiration for Each Day of the Year
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)
Chinese Proverbs
The Oxford Dictionary of Quotations
101 French Proverbs
The Most Brilliant Thoughts of All Time (In Two Lines or Less)