Who said "Fear is just the absence of understanding."?

This quote is attributed to Doc Brown.

Fear is just the absence of understanding. - Doc Brown

"Fear is just the absence of understanding."

Doc Brown Fear

"This is heavy."

"There's that word again, 'heavy.' Is there something wrong with the Earth's gravitational pull in the future?"

"Great Scott!"

"If my calculations are correct, when this baby hits eighty-eight miles per hour, you're gonna see some serious shit."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."