Who said "Leaders serve, they don't rule."?

This quote is attributed to Guardians of the Galaxy.

Leaders serve, they don't rule. - Guardians of the Galaxy

"Leaders serve, they don't rule."

Guardians of the Galaxy Leadership

"I'm your friend, man. I do this because you're my friend."

"Sometimes the thing you fight the most is the thing you need the most."

"We are Groot."

"You're welcome for saving the galaxy, by the way."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"