That lesson seems to have been lost on a number of people this week.
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Paul Reubens, a comedian known for his kid-friendly role as Pee Wee Herman, learned that lesson.
That lesson has come through time and again via industry studies, including one from Barra.
And Mr Osborne will not be the only figure to have learnt that lesson.
Which is something of a pity as everyone thought that we had learned that lesson.
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And we have taken that lesson, and so now we're full on top of it.
The cost of that lesson is now being borne by the developed world's taxpayers.
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When applied to finances, that lesson can help ordinary couples do extraordinary things with their money.
But it appears unlikely that lesson can be transmitted to the Arab and Muslim worlds.
That lesson should've been learned two years ago when Republicans tried to abolish personal taxes on dividends.
We must ensure that policymakers, businesses and investors act on that lesson before the next catastrophe strikes.
Keynes saw the world learn that lesson the hard way in the years after World War I.
For that lesson, we need only know one thing: the train is already pulling out of the station.
And while that lesson is impossible to emulate, he also pounced on opportunities as they came to him.
Some buyers of Wright homes didn't learn that lesson until their deals closed.
However, the fund learnt that lesson within a month, urging the Koreans to ignore the fund's own fiscal conditions.
Today, decades after I fixed that flashlight, I hold that lesson very dear.
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Two years ago, Yesh founded the JGI Ideas program in Bangalore to help pass that lesson on to other students.
Vyhnanek learned that lesson the hard way as owner and head chef of the old Harvard Street Grill in Brookline, Mass.
If policymakers learn that lesson from Greenspan's era and its aftermath, then, perversely, Alan Greenspan's legacy will be a positive one.
Brian Pinero, director of the National Dating Abuse Helpline run by a nonprofit called Love is Respect, knows that lesson well.
Maybe George can teach Hollywood that lesson by showing a strong box office showing this weekend and better yet, next weekend.
Ralph Lauren and Wal-Mart may be learning that lesson the hard way.
The Republicans in Congress are melting down as they learn that lesson.
If history has taught investors a lesson, that lesson is not to bet against banks, especially the ones that are too big to fail.
Power-One's boss Goldman has incorporated that lesson into his management style.
And the coda seems to only duplicate, or retweet, that lesson.
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Britain has learned that lesson many times before in our history.
What that lesson might be is a little hard to decipher.
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We learned that lesson only too well in China with Oreo.
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