"Reason cannot pierce the armor of a stubborn ignoramus."

http://lifehacker.com/when-to-stop-trying-to-win-an-argument-1797876592

“You can’t debate an unwilling opponent. You can’t reason with someone who makes up their own facts.”

"Belief is for children. Facts are for men."

"Facts are stubborn things."

"'As a matter of fact' is an expression that precedes many an expression that isn't."

"It is as fatal as it is cowardly to blink (at) facts because they are not to our taste."

"Everyone is entitled to his own opinion, but not to his own facts."

"And while everyone is entitled to their opinions, facts are not negotiable."