Who said "The only way out is through."?

This quote is attributed to Cheswick.

The only way out is through. - Cheswick

"The only way out is through."

Cheswick Perseverance

Character in One Flew Over the Cuckoo's Nest

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"I'm tired of this game."

"You got to be crazy to live here."

"We're all in the same boat."

"The way I see it, the guy is not a fool. He's just trying to get by."

"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."