I never view mistakes as failures. They are simply opportunities to find out what doesn't work.

Friendship is the heaven of life.

Through all the years of experimenting and research, I never once made a discovery. I start where the last man left off... All my work was deductive, and the results I achieved were those of invention pure and simple.

I am long on ideas, but short on time. I expect to live to be only about a hundred.

The first requisite for success is to develop the ability to focus and apply your mental and physical energies to the problem at hand - without growing weary. Because such thinking is often difficult, there seems to be no limit to which some people will go to avoid the effort and labor that is associated with it.

Most of my ideas belonged to other people who never bothered to develop them.

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.