The telephone will be used to inform people that a telegram has been sent.

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.

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

When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.

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.

Observe, Remember, Compare.

Leave the beaten track behind occasionally and dive into the woods. Every time you do you will be certain to find something you have never seen before.