There is no subsitute for hard work.

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 10,000 times. I have succeeded in proving that those 10,000 ways will not work.

My success is due more to my ability to work continuously on one thing without stopping than to any other single quality.

I never did anything worth doing entirely by accident. . . Almost none of my inventions came about totally by accident. They were achieved by having trained myself to endure and tolerate hard work.

I never perfected an invention that I did not think about in terms of the service it might give others... I find out what the world needs, then I proceed to invent.

If I had not had so much ambition and not tried to do so many things, I probably would have been happier, but less useful.