"The ability and inclination to use physical strength is no indication of bravery or tenacity to life. The greatest cowards are often the greatest bullies. Nothing is cheaper and more common than physical bravery."

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I've found out why people laugh. They laugh because it hurts- because it's the only thing that'll make it stop hurting... I had been told that a 'funny' thing is a thing of goodness. It isn't... The goodness is in the laughing. I grok it is a bravery- and a sharing- against pain and sorrow and defeat.

— Robert A. Heinlein