Kundera, Milan

...the only truly serious questions are the ones that even a child can formulate. Only the most naive of questions are truly serious. They are questions with no answers. A question with no answer is a barrier that cannot be breached. In other words, it is questions with no answers that set the limits of human possibilities, describe the boundaries of human existence.

The Unbearable Lightness of Being Part 4 Section 6 (p. 139)

Landau, Lev

Physicists have learned that certain questions cannot be asked, not because the level of our knowledge does not yet permit us to find the answer, but because such an answer simply isn't stored in nature.

In Alexandre Dorozynski The Man They Wouldn't Let Die Chapter 7 (p. 108)

Payne-Goposchkin, Cecila H.

Whenever we look in nature we can see spiral forms in the uncurling fern, the snail, the nautilus shell, the hurricane, the stirred cup of coffee, the water that swirls out of a wash bowl. Perhaps we shouldn't be surprised to see spirals in the great star systems whirling in space. Yet they remain a great, intriguing question.

Scientific American Why Do Galaxies Have a Spiral Form? (p. 89) Volume 189, Number 3, September 1953

Popper, Karl

...a young scientist who hopes to make discoveries is badly advised if his teacher tells him, "Go round and observe", and that he is well advised if his teacher tells him: "Try to learn what people are discussing nowadays in science. Find out where the difficulties arise, and take an interest in disagreements. These are the questions which you should take up."

Conjectures and Refutations Chapter 4 (p. 129)

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