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Bravery is a complicated thing to describe. You can't say it's three feet long and two feet wide and that it weighs four hundred pounds or that it's colored bright blue or that it sounds like a piano or that it smells like roses. It's a quality, not a thing.

Mickey Mantle (1964). “The Quality of Courage”, p.28, U of Nebraska Press
Bravery is a complicated thing to describe. You can't say it's three feet long and two feet wide and that it weighs four hundred pounds or that it's colored bright blue or that it sounds like a piano or that it smells