If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.
– Sun Tzu, The Art of War
http://www.goodreads.com/quotes/17976-if-you-know-the-enemy-and-know-yourself-you-need
An insincere and evil friend is more to be feared than a wild beast; a wild beast may wound your body, but an evil friend will wound your mind.
– The Buddha
http://www.brainyquote.com/quotes/quotes/b/buddha100739.html
Integrity is not a 90 percent thing, not a 95 percent thing; either you have it or you don’t.
– Peter Scotese
http://quotationsbook.com/quote/21267/
Imagination will often carry us to worlds that never were. But without it we will go nowhere.
– Carl Sagan
http://www.goodreads.com/quotes/9812-imagination-will-often-carry-us-to-worlds-that-never-were
We should not judge people by their peak of excellence; but by the distance they have traveled from the point where they started.
– Henry Ward Beecher
http://www.goodreads.com/quotes/78685-we-should-not-judge-people-by-their-peak-of-excellence
Five enemies of peace inhabit with us – avarice, ambition, envy, anger and pride. If these were to be banished, we should infallibly enjoy perpetual peace.
– Francesco Petrarca (July 20, 1304 – July 19, 1374)
http://www.quotes.net/quote/16357
My friends, how desperately do we need to be loved and to love. When Christ said that man does not live by bread alone, he spoke of a hunger. This hunger was not the hunger of the body. It was not the hunger for bread. He spoke of a hunger that begins deep down in the very depths of our being. He spoke of a need as vital as breath. He spoke of our hunger for love.
– Chief Dan George, The Wisdom of the Native Americans edited by Kent Nerburn
http://www.virtuesforlife.com/native-american-wisdom-on-love/
http://www.greatthoughtstreasury.com/?q=taxonomy/term/127&page=2