„If I were to awaken after having slept for a thousand years, my first question would be: Has the Riemann hypothesis been proven?“

— David Hilbert

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„I had hoped, at my departure, I would feel sure and knowledgeable about everything that lay ahead -- after all, I had been "analyzed." Instead, all I could see were question marks.“
— Sylvia Plath
„I regret nothing. There have been things I missed, but I ask no questions, because I have loved it, such as it has been, even the moments of emptiness, even the unanswered-and that I loved it, that is the unanswered in my life.“
— Ayn Rand
„There has been an earth for a little more than a billion years. As for the question of the end of it I advise: Wait and see!“
— Albert Einstein
„Those who raise questions about the God hypothesis and the soul hypothesis are by no means all atheists.“
— Carl Sagan