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

I have always considered myself as an Agnostic.

It is the man who carefully advances step by step...who is bound to succeed in the greatest degree.

Don't keep forever on the public road, going only where others have gone and following one after the other like a flock of sheep. Leave the beaten track occasionally and dive into the woods.

What this power is I cannot say; all I know is that it exists and it becomes available only when a man is in that state of mind in which he knows exactly what he wants and is fully determined not to quit until he finds it.

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

The great advantage [the telephone] possesses over every other form of electrical apparatus consists in the fact that it requires no skill to operate the instrument.