Who said "I gotta be true to myself. That's all that matters."?

This quote is attributed to Marty McFly.

I gotta be true to myself. That's all that matters. - Marty McFly

"I gotta be true to myself. That's all that matters."

Marty McFly Truth

"This is heavy."

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

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

"You're my best friend, and I care about you, but don't ask me to do this."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."