Who said "I've spent thirty years preparing for this moment."?

This quote is attributed to Doc Brown.

I've spent thirty years preparing for this moment. - Doc Brown

"I've spent thirty years preparing for this moment."

Doc Brown Perseverance

"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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."