Source: If: A Father's Advice to His Son
“If you can keep your head when all about are losing theirs, it's just possible that you haven't grasped the situation.”
"Introduction"
Please Don't Eat the Daisies (1957)
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Jean Kerr 14
Irish-American author and playwright 1922–2003Related quotes
“When you've exhausted all possibilities, remember this: You Haven't!”
Not located in Edison's writings, but found in Robert H. Schuller's self-help book Tough Times Never Last, But Tough People Do! from 1983 https://books.google.com/books?id=8oTOa4n3k4oC&pg=PA28&dq=%22exhausted+all+possibilities%22+remember&hl=en&sa=X&ved=0ahUKEwiL88bb6-vKAhVD-mMKHVzNDVEQ6AEIHTAA#v=onepage&q=%22exhausted%20all%20possibilities%20remember%20this%22&f=false.
Disputed
Source: https://www.facebook.com/photo.php?fbid=346794326803029&set=pb.100044173926915.-2207520000.&type=3