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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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Prediction of the future is possible only in systems that have stable parameters like celestial mechanics. The only reason why prediction is so successful in celestial mechanics is that the evolution of the solar system has ground to a halt in what is essentially a dynamic equilibrium with stable parameters. Evolutionary systems, however, by their very nature have unstable parameters. They are disequilibrium systems and in such systems our power of prediction, though not zero, is very limited because of the unpredictability of the parameters themselves. If, of course, it were possible to predict the change in the parameters, then there would be other parameters which were unchanged, but the search for ultimately stable parameters in evolutionary systems is futile, for they probably do not exist... Social systems have Heisenberg principles all over the place, for we cannot predict the future without changing it.

 

Kenneth Boulding

 

It is difficult for a statesman who still has a political future to reveal everything that he knows: and in a profession in which one is a baby at 50 and middle-aged at seventy-five, it is natural that anyone who has not actually been disgraced should feel that he still has a future.

 

George Orwell

 

When the number of factors coming into play in a phenomenological complex is too large, scientific method in most cases fails us. One need only think of the weather, in which case prediction even for a few days ahead is impossible. Nevertheless no one doubts that we are confronted with a causal connection whose causal components are in the main known to us.
Occurrences in this domain are beyond the reach of exact prediction because of the variety of factors in operation, not because of any lack of order in nature.

 

Albert Einstein

 

I do not know how Vladimir Putin will be esteemed by the future history, but I have no doubt that among his successes and advantages for Russia historians shall absolutely note the fact of his not altering the constitution, for he created a precedent. And afterwards, no matter who might become president, it shall be extremely difficult to alter the constitution exactly on that point. Extremely difficult.

 

Vladimir Posner

 

We are indeed living at the end of the Golden Age of Mankind, or at least the end of this particular human civilization. That almost everything we take for granted today may, only a couple of decades farther along, seem entirely remarkable, that our most mundane artefacts and toys will stand as incredible examples of luxury and excess. That all of this will pass away, and the "simplest" bits of our day-to-day lives will become miracles of a half-remembered past. A past which will be responsible for that future-present misery. It is difficult to force myself through the trivial routine of my days when these thoughts are front and center. It is difficult to see beyond the veil they draw up about me and difficult to push it all aside long enough to write my silly little stories.

 

Caitlin R. Kiernan