Who said "Fear is the greatest motivator."?

This quote is attributed to Lombard.

Fear is the greatest motivator. - Lombard

"Fear is the greatest motivator."

Lombard Fear

Character in And Then There Were None

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"We are all condemned men."

"Every man for himself."

"Trust no one on this island."

"The sea surrounding us is like a wall"

"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."