To those searching for truth -- not the truth of dogma and darkness but the truth brought by reason, search, examination, and inquiry, discipline is required. For faith, as well intentioned as it may be, must be built on facts, not fiction -- faith in fiction is a damnable false hope.

A good intention, with a bad approach, often leads to a poor result.

Be brave as your fathers before you. Have faith and go forward.

Vision without execution is delusion.

We haven't failed. We now know a thousand things that won't work, so we are much closer to finding what will.

Of all my inventions, I liked the phonograph best

Radio is just a fashion contrivance that will soon die out. It is obvious that there never will be invented a proper receiver!