Friendship is the heaven of life.

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.

I failed my way to success.

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.

As a cure for worrying, work is far better than whiskey. I always found that, if I began to worry, the best thing I could do was focus upon doing something useful and then work very hard at it. Soon, I would forget what was troubling me.

There is a better way for everything. Find it.

Of all my inventions, I liked the phonograph best