Who said "The mind plays tricks when fear takes hold"?

This quote is attributed to Armstrong.

The mind plays tricks when fear takes hold - Armstrong

"The mind plays tricks when fear takes hold"

Armstrong Fear

Character in And Then There Were None

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"We are none of us infallible."

"The innocent suffer with the guilty."

"Each of us has something to hide."

"We deserve what comes."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."