If you have an apple and I have an apple and we exchange apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.
Translation
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Quotes about idea:
The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.
Where does this idea come from? It is like a pair of glasses on our nose through which we see whatever we look at. It never occurs to us to take them off.
For it must not be supposed that merely because the justness of an idea has been proved it can be productive of effective action even on cultivated minds. This fact may be quickly appreciated by noting how slight is the influence of the clearest demonstration on the majority of men.
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