Who said "Trust no one when survival is at stake."?

This quote is attributed to Vera Claythorne.

Trust no one when survival is at stake. - Vera Claythorne

"Trust no one when survival is at stake."

Vera Claythorne

Character in And Then There Were None

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"Vera reflected on how past mistakes can define one's entire existence"

"She understood that fear was her constant companion on the island"

"I have no friends. I have never had friends."

"The sea is a wonderful place."