Who said "We could not afford to let him know the real stakes."?

This quote is attributed to Graff.

We could not afford to let him know the real stakes. - Graff

"We could not afford to let him know the real stakes."

Graff

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."