“Man's fatal flaw is misplaced optimism.”
“There's nothing worse than misplaced optimism.”
“Optimism is the first symptom that any disease is fatal.”
“Your faith in Homo technologicus -the Tinkering Man- has one fatal flaw. It offers you no escape clause.”
“Handsome and brilliantly rich; their fatal flaw is murder.”
“I'm a coward when it comes to matters of the heart. That is my fatal flaw.”