Who said "I learned to value honesty above all else."?

This quote is attributed to George McFly.

I learned to value honesty above all else. - George McFly

"I learned to value honesty above all else."

George McFly Truth

"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."

"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."