Robert A. Heinlein Quotes on Experience
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Life is short, but the years are long.
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Human beings hardly ever learn from the experience of others. They learn; when they do, which isn't often, on their own, the hard way.
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The first time I was a drill instructor I was too inexperienced for the job - the things I taught those lads must have got some of them killed. War is too serious a matter to be taught by the inexperienced.
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You live and learn. Or you don't live long.