Selected quotation
"When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years."
~ Mark Twain
Various books with quotations, aphorisms and proverbs:
The Yale Book of Quotations
The Book of Positive Quotations, 2nd Edition
Everyday Positive Thinking
Doonesbury.com's The War in Quotes
Best Quotations for All Occasions
The Oxford Dictionary of Quotations
The Wise and Witty Quote Book: More than 2000 Quotes to Enlighten, Encourage, and Enjoy
Apronisms: Pocket Wisdom for Every Day
101 French Proverbs
The Proverbs Driven Life: Timeless Wisdom for Your Words, Work, Wealth, and Relationships
America's Popular Sayings: Over 1600 Expressions on Topics from Beauty to Money and Everything In Between
8,789 Words of Wisdom