It is apparent to me that the possibilities of the aeroplane, which two or three years ago were thought to hold the solution to the [flying machine] problem, have been exhausted, and that we must turn elsewhere.

Vision without execution is delusion.

Most of the exercise I get is from standing and walking around laboratory tables all day. I derive more benefit and entertainment from this than some of my friends and competitors get from playing games like golf.

I was always afraid of things that worked the first time. Long experience proved that there were great drawbacks found generally before they could be got commercial; but here was something there was no doubt of.

I have been at work for some time building an apparatus to see if it is possible for personalities which have left this earth to communicate with us.

I have not failed. I've just found 10,000 ways that won't work.

The strength of the Constitution, lies in the will of the people to defend it.