Who said "We must protect what we hold dear."?

This quote is attributed to Doc Brown.

We must protect what we hold dear. - Doc Brown

"We must protect what we hold dear."

Doc Brown

"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."