"The desire to fly is an idea handed down to us by our ancestors who, in their dim terrestrial captivity, looked enviously on the birds soaring freely through space…"

"The greatest value of our work is that it will be an inspiration to others."

"I know of only one bird — the parrot — that talks; and it can't fly very high."

"The greatest obstacle to progress is not ignorance, but the illusion of knowledge."

"We were not as a matter of fact in the habit of thinking of the future. We were too busy with the present."