Selected quotation
"Humans are amphibians - half spirit and half animal. [...] As spirits they belong to the eternal world, but as animals they inhabit time."
~ Clive Staples Lewis, "The Screwtape Letters"
Various books with quotations, aphorisms and proverbs:
The Book of Positive Quotations, 2nd Edition
The Ultimate Guide to the Perfect Word: Quotes - Titles - Poetry - Tips - Words
The Oxford Dictionary of Quotations
8,789 Words of Wisdom
America's Popular Sayings: Over 1600 Expressions on Topics from Beauty to Money and Everything In Between
A Continual Feast: Words of Comfort and Celebration, Collected by Father Tim
Positive Thinking Every Day: An Inspiration for Each Day of the Year
Everyday Positive Thinking
The Yale Book of Quotations
The Proverbs Driven Life: Timeless Wisdom for Your Words, Work, Wealth, and Relationships
Great Quotes from Great Leaders
Bartlett's Familiar Quotations: A Collection of Passages, Phrases, and Proverbs Traced to Their Sources in Ancient and Modern Literature (17th Edition)