Who said "Adventure is running toward an unknown end."?

This quote is attributed to Thomas.

Adventure is running toward an unknown end. - Thomas

"Adventure is running toward an unknown end."

Thomas Adventure

Character in The Maze Runner

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"Survive first. Figure out the rest later."

"We're not going to die. Not here, not now."

"The Maze is the key to everything."

"Fear is a choice."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."