A comment from Clive J. Grant reads:
I'm not permitted to tell you what lay behind it, but I traveled to Princeton, in the company of a textile expert, to discuss something with Einstein. What I remember is that he said,
If I give you a pfennig, you will be one pfennig richer and I'll be one pfennig poorer. But if I give you an idea, you will have a new idea but I shall still have it, too.I never did get the idea, but I did get the aphorism.
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