The survival of Ernest Shackleton and the crew of the Endurance on the ice-bound Antarctic sea has, for the past century, defined heroism.

“Optimism is true moral courage.”

Ernest Shackleton

As quoted in South with Shackleton by L. D. A. Hussey and in
The National Geographic Magazine (1998), Vol. 194, p. 90

 Photo: Frank Hurley via Wikimedia Commons, Public Domain