Who said "A child's greatest strength is his ability to change."?

This quote is attributed to Mazer Rackham.

A child's greatest strength is his ability to change. - Mazer Rackham

"A child's greatest strength is his ability to change."

Mazer Rackham Change

Character in Ender's Game

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"Half a day for sleep, and the rest for games and training."

"I know what it is to be a soldier. But these little boys?"

"He'll do what needs to be done."

"The human factor is what makes this possible."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."