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“It would appear that we have reached the limits of what it is possible to achieve with computer technology, although one should be careful with such statements, as they tend to sound pretty silly in five years.”

— John von Neumann, 1949

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“I confess that, in 1901, I said to my brother Orville that men would not fly for 50 years. Two years later, we ourselves were making flights. This demonstration of my inability as a prophet gave me such a shock that I have ever since distrusted myself and have refrained from all prediction.” — Wilbur Wright

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“I played over the music of that scoundrel Brahms. What a giftless bastard! It annoys me that this self-inflated mediocrity is hailed as a genius. Why, in comparison with him, Raff is a giant, not to speak of Rubinstein, who is after all a live and important human being, while Brahms is chaotic and absolutely empty dried-up stuff.” — Tchaikovsky’s diary, Oct. 9, 1886

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“Moreover, the satellites of Jupiter are invisible to the naked eye, and therefore can exercise no influence over the Earth, and therefore would be useless, and therefore do not exist.” — Astronomer Francesco Sizzi, on Galileo’s claim to have seen the moons of Jupiter