What an awesome thread!
Some of my favorites:
"Be kind, for everyone you meet is fighting a hard battle." Plato
"I am the master of my fate. I am the captain of my soul." Henley
"The softest pillow is a clear conscience." Norman Vincent Peale
"Live as if you were to die tomorrow. Learn as if you were to live forever." Ghandi
And, of course, the Rand quote from my signature...
Just a few...I could do this all day!