Orville Wright

The airplane stays up because it doesn't have the time to fall.

If we all worked on the assumption that what is accepted as true is really true, there would be little hope of advance.

With all the knowledge and skill acquired in thousands of flights in the last ten years, I would hardly think today of making my first flight on a strange machine in a twenty-seven mile wind, even if I knew that the machine had already been flown and was safe.