What doesn't destroy me makes me stronger. (Friederich Nietzshe)

A physicist's most important tool is to be able to flip a problem around, and approach it from a totally different perspective. (Terrence Kite)

I do not agree with a word you say, but I will fight to the death, your right to say it. (Voltaire)

I know you believe you understand what you think I said, but I am not sure you realize that what you heard is not what I meant. (Unknown)

Those who don't know what they can't do often solve problems quicker. (Bob Goldstone)

a nice article