Great thread, Lori.  Here's one of my favorites:

"“Leadership is a potent combination of strategy and character. But if you must be without one, be without the strategy.” – Norman Schwarzkopf

"If all printers were determined not to print anything until they were sure it would offend nobody, there would be very little printed."    Benjamin Franklin

 "Yes, I am. I know everything I can think of." Hannah, 8 years old, responding to her father's question "do you think you're smart?" while in the midst of arguing with her younger brother. 

Telling the truth means never having to remember what I said................?

Someone said this to me after it was taking a ridiculously long time to re-wire one of the facilities at work, referring to the guys working in there...

"If you put an infinite number of monkeys in a room each with a typewriter and give them an infinite amount of time, they will eventually generate the collective works of Shakespeare."

"May I live simply, that others may simply live."  I think it's most often attributed to Gandhi, but I'm not sure if that's accurate.  I have this quote hanging up right above the shelf I keep my purse on, so I see it everyday.  A little cliche, yes, but still a good one.  

"Be careful when you fight the monsters, lest you become one." Nietzsche.  What better way to remember not to resort to dirty tactics... a lesson I'm afraid I forget sometimes :(

But for the grace of god there go I.......................I have alway liked this one.

Tolerance becomes a crime when applied to evil - Thomas Mann

Just remember, wherever you go, there you are.

Only the dead have seen the end of war." by Plato

I was seldom able to see an opportunity until it had ceased to be one.

  Mark Twain

I use live and let live often because it often applies.  However, my favorite quote is "Liking is probably the best form of ownership, ownership the worst form of liking" -- by magical realism author Jose Saramago

"The difference between the past and future is only a stubbornly persistent illusion." Albert Einstein

"Evil is the vulgar lover who loves the body rather than the soul, inasmuch as he is not even stable, because he loves a thing which is in itself unstable." The Symposium---Plato

"This is the strangest life I have ever known." James Douglas Morrison

This is my favorite I have it posted at work and it's from Martin Luther King Jr.

"The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy."

My all time favorite - "You get what you settle for." Louise to Thelma