Doc Brown

"Listen, all I can tell you is that in the future, we don't make very good time machines."

"I'm sure that in 1985, plutonium is available at every corner drugstore, but in 1955, it's a little hard to come by."

"I've got to get you up to eighty-eight miles per hour."

"This is the future. Things are different here."

"You've got to believe me. I know this sounds insane, but I'm from the future."

"The consequences of this event could be disastrous."

"I think I'm beginning to understand dimensional physics."

"This is only a delay. We can overcome this."

"What really matters is that you're trying to be a better person."

"Action is what matters. What we do."

"I'm a scientist. I deal in facts, not hypotheticals."

"The space-time continuum is your responsibility now."

"Marty, you're my best friend. And I'm not going to let you down."

"All we need is a little faith and determination."

"I'm running 1.21 gigawatts of power through this thing."

"The only way to get him to go back in time is to appeal to his scientific curiosity."

"We've got to work together. That's the only way."

"I've calculated every variable. This will work."

"The flux capacitor... it's what makes time travel possible."

"Your future hasn't been written yet. No one's has."

"I didn't invent time travel for profit. I invented it to benefit mankind."

"Sometimes great change comes from small decisions."

"You must approach this with your mind, not your emotions."

"The past is fixed, but the future is in motion."

"I believe in the goodness of humanity."

"Innovation requires risk."

"I've devoted my life to understanding the mysteries of time."

"Science gives us the power to change our world."

"You've got to make your own luck."

"History is not written in stone."