Who said "You're the only one who can make a difference."?

This quote is attributed to Graff.

You're the only one who can make a difference. - Graff

"You're the only one who can make a difference."

Graff Motivation

Character in Ender's Game

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"A commander's most important job is to give orders that can be obeyed."

"Humanity does not ask us to be happy. It merely asks us to be brilliant on its behalf."

"He's too much a leader already."

"You are the hope of humanity."

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."