"Happiness does not depend on outward things, but on the way we see them." 
-Leo Nikolayevich Tolstoy

"The foolish reject what they see, not what they think; the wise reject what they think, not what they see." 

-Huang Po

"We don't see things as they are. We see things as we are." 
-Anaïs Nin

"I hear and I forget. I see and I remember. I do and I understand."
-Confucius