The doctor of the future will give no medicine, but will involve the patient in the proper use of food, fresh air and exercise
First be sure a thing is wanted or needed, then go ahead.
I never failed once. It just happened to be a 2000-step process.
I've realized that most of my best ideas have followed a good night's sleep.
Radio is just a fashion contrivance that will soon die out. It is obvious that there never will be invented a proper receiver!
Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.