Who said "The boy must be tested to his limits."?

This quote is attributed to Graff.

The boy must be tested to his limits. - Graff

"The boy must be tested to his limits."

Graff Perseverance

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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."