Selected quotation

"The test of all beliefs is their practical effect in life. If it be true that optimism compels the world forward, and pessimism retards it, then it is dangerous to propagate a pessimistic philosophy."

~ Helen Keller



Various books with quotations, aphorisms and proverbs:

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

Ancient Wisdom: The Book of Proverbs With Devotions for Today

The Ultimate Guide to the Perfect Word: Quotes - Titles - Poetry - Tips - Words

Everyday Positive Thinking

8,789 Words of Wisdom

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

Offerings: Buddhist Wisdom for Every Day (Offerings for Humanity)

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

Doonesbury.com's The War in Quotes

The Book of Positive Quotations, 2nd Edition

365 Inspirational Quotes (365 Days Perpetual Calendars)