Who said "Sometimes you need to be alone to think."?

This quote is attributed to Marty McFly.

Sometimes you need to be alone to think. - Marty McFly

"Sometimes you need to be alone to think."

Marty McFly Solitude

"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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."