The nation that secures control of the air will ultimately control the world.

I have had the feeling that a properly constructed flying-machine should be capable of being flown as a kite; and conversely, that a properly constructed kite should be capable of use as a flying-machine when driven by its own propellers.

Washington is no place in which to carry out inventions

Man is the result of slow growth; that is why he occupies the position he does in animal life. What does a pup amount to that has gained its growth in a few days or weeks, beside a man who only attains it in as many years.

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.

Man is an animal which, alone among the animals, refuses to be satisfied by the fulfillment of animal desires.

First words on the first telephone - "Mr. Watson - come here - I want to see you."