“I vehemently disagree with what you say, sir – but I would fight, if necessary risking my life, for your right to say it. A Philosopher      

“The ultimate test of a relationship is to disagree, but still hold hands.” Unknown

“It is the mark of an educated mind to be able to entertain a thought without accepting it.” Aristotle

“Honest disagreement is often a good sign of progress.” Mahatma Ghandi

“The quitter you become, the more you can hear.” Dr. Richardard Alpert

“The most important thing in communication is to hear what is not being said.” Peter Ducker