"The difficulties of the problem are so great that few have dared to attack it."

"Success in inventing depends on the close observation of nature."

"The machine itself was a thing of beauty, a marvel of ingenuity and simplicity."

"We have at last succeeded in making a machine that will fly."

"I confess that, in 1901, I said to my brother Orville that men would not fly for 50 years. Two years later, we were making flights. This demonstration of my inability as a prophet gave me such a shock…"