Who said "Hope is the most powerful force in the world."?

This quote is attributed to Kaladin Stormblessed.

Hope is the most powerful force in the world. - Kaladin Stormblessed

"Hope is the most powerful force in the world."

Kaladin Stormblessed Hope

Character in The Way of Kings

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"A man can change his own future."

"I will protect those who cannot protect themselves."

"What if I'm stronger than I think I am?"

"They are like traders of emotion."

"Every day is a new opportunity."

"Hope is what gets us through difficult times."

"I'm not your enemy, kid. I'm trying to save you."

"Redemption is a long road."