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The world hates change, yet it is the only thing that has brought progress.
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There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.
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If you have always done it that way, it is probably wrong.
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You can't have a better tomorrow if you are thinking about yesterday all the time.
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A problem well stated is a problem half-solved.
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We should all be concerned about the future because we will have to spend the rest of our lives there.
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A person must have a certain amount of intelligent ignorance to get anywhere.
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There will always be a frontier where there is an open mind and a willing hand.
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Every time you tear a leaf off a calendar, you present a new place for new ideas and progress.
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Inventing is a combination of brains and materials. The more brains you use, the less material you need.
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You can be sincere and still be stupid.
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The only time you mustn't fail is the last time you try.
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The only difference between a problem and a solution is that people understand the solution.
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If you want to kill any idea in the world, get a committee working on it.
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We need to teach the highly educated man that it is not a disgrace to fail and that he must analyze every failure to find its cause. He must learn how to fail intelligently, for failing is one of the greatest arts in the world.
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People think of the inventor as a screwball, but no one ever asks the inventor what he thinks of other people.
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Believe and act as if it were impossible to fail.
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Keep on going and the chances are you will stumble on something, perhaps when you are least expecting it. I have never heard of anyone stumbling on something sitting down.
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I object to people running down the future. I am going to live all the rest of my life there.
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The Wright brothers flew right through the smoke screen of impossibility.
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No one would have crossed the ocean if he could have gotten off the ship in the storm.
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People are very open-minded about new things - as long as they're exactly like the old ones.
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You will never stub your toe standing still. The faster you go, the more chance there is of stubbing your toe, but the more chance you have of getting somewhere.
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Problems are the price of progress. Don't bring me anything but trouble. Good news weakens me.