"I confess that in 1901 I said to my brother Orville that man would not fly for fifty years."

"If we worked on the assumption that what is currently regarded as impossible is really impossible, we should never have made any progress."

"The course of the experiment was not exactly according to program. The machine started to make a series of dives and dashes in various directions. It was a rather wild ride."

"The flying machine is a thing of the future, and it is a thing that will change the world."

"We kept at it, and we kept on learning."