Man will not fly for 50 years.

Wilbur Wright : inventor
Wilbur Wright said these words: "I confess that in 1901 I said to my brother Orville that man would not fly for fifty years. Two years later we ourselves made flights. This demonstration of my impotence as a prophet gave me such a shock that ever since I have distrusted myself and avoided all predictions."

speech to the Aero Club of France (Nov 5, 1908)