Who said "Hard work in pursuit of a dream is never wasted effort."?

This quote is attributed to Dr. Emmett Brown.

Hard work in pursuit of a dream is never wasted effort. - Dr. Emmett Brown

"Hard work in pursuit of a dream is never wasted effort."

Dr. Emmett Brown Work

"Great Scott!"

"This is heavy."

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

"If my calculations are correct, when this baby hits 88 miles per hour, you're gonna see some serious shit."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."