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Niels Bohr

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Prediction is very difficult, especially about the future.
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As quoted in Teaching and Learning Elementary Social Studies (1970) by Arthur K. Ellis, p. 431
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The above quote is also attributed to various humourists and the Danish poet Piet Hein: "det er sv?rt at sp? - is?r om fremtiden"
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It is also attributed to danish cartoonist Storm P (Robert Storm Petersen).
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The Danish source, used by Bohr and Petersen, has been traced back to Markus M. Ronner in 1918 by lundskovdk-citater.
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Variant: It's hard to make predictions, especially about the future.

 
Niels Bohr

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