Great discoveries and improvements invariably involve the cooperation of many minds.

Neither the Army nor the Navy is of any protection, or very little protection, against aerial raids.

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

You cannot force ideas. Successful ideas are the result of slow growth. Ideas do not reach perfection in a day, no matter how much study is put upon them.

The most successful men in the end are those whose success is the result of steady accretion.

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.

Sometimes we stare so long at a door that is closing that we see too late the one that is open.