Who said "Maybe we shouldn't have come here. Maybe it's not safe."?

This quote is attributed to George McFly.

Maybe we shouldn't have come here. Maybe it's not safe. - George McFly

"Maybe we shouldn't have come here. Maybe it's not safe."

George McFly Fear

"I'm your density. I mean, your destiny."

"This is heavy."

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

"I'm not very good at science."

"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."